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Pants waist adjustment - a darting adventure!

Sara Hartwin

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posted 2 years ago

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Background
I currently source my pants and shirts from thrift stores. Buying them is usually just step 1; often I need to adjust the fit somehow before they're ready to wear. With pants, I typically need to shorten the legs and/or take in the waist.
My last thrift trip gained me 5 pairs, 4 of which needed waist reductions. My go-to method has been to take a "V" of fabric away from the back middle seam, then reassemble. Pretty straightforward!
...except for that annoying center belt loop.
...and except for sewing through that thick fabric fold where all the seams come together.
...and except for the little funny wrinkle left at the bottom of the V if I don't get it shaped juuuust right.
(I don’t think I have ever gotten it shaped "just right".)

But what's this? While examining one pair of my "new" pants, I see existing back waistband darts already in place, one above each of the back pockets:

Ooh! Two darts?!? Very cool. (Why didn't I think of that before....?)
Two darts means I can divide the waist adjustment amount between them. Two darts means the Vs won't be as long or wide. Two darts might even mean I don't have funny bumps!! And BONUS! - two darts mean I don't have to remove ANY belt loops.
I'm trying it!

To avoid suspense - it worked! Here's the final result:

I'll post some notes, the step-by-step pictures, some resources, and things that helped me in the following posts.

Aspirations: She seeks wool and flax, considers a field and buys it, girds herself with strength, opens her mouth with wisdom, and does him good all the days of her life. (pieces of Proverbs 31, NKJV)

Sara Hartwin

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posted 2 years ago

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A few notes
I like working projects like this because it expands my understanding of how making 2-dimensional changes translates to 3-dimensional fit. For instance – darts aren’t just for taking away fabric. I can create fabric shapes with them, too. And they’re versatile - in the future, I could potentially distribute the fabric reduction over 4 darts, and have 2 front waist darts and 2 back waist darts.
I want to begin thinking of darts as a tool in my pattern drafting kit.
These pants aren't constructed like typical jeans. There is only an inner waistband: the outer waist is simply the top of the leg panels.

Sara Hartwin

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posted 2 years ago

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Step by step, part 1
Separate waistband from pants around each dart. Unpick enough that I can work in the area.
In this case there are two seams to release: the bottom/lower waistband seam...

...and the top/upper seam.

Both dart areas are free now. Hmm, the darts extend down past the pocket flaps. I’m going to need to partially rip those seams…

Then I can measure and pin each of the new darts to prep for sewing:

Sara Hartwin

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posted 2 years ago

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Step by step, part 2
Darts sewn! At this point I did a quick fit check – the waist felt great and looked good enough for my standards. Better do something about all that extra waistband, though.

Snip-snip!

Some tutorials have you take in the waistband before taking in the pants, but I prefer to do pants first, then match the waistband to the pants.

Now I can flatten each new end against the pants and mark it in line with the new dart seam. I pin the waistband right sides together, matching the marks. You can see my pencil marks here:

The marks become the stitching line.

Trim the seams to ~1/4”, press ‘em open, then press darts and waistband.

Sara Hartwin

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posted 2 years ago

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Step by step, part 3
Oh – gotta reassemble those pocket flaps now. I only ripped out a small section around the dart tips, but they’ll need repositioning if I want them to lay flat again. Here, I prioritize economy of time/effort over having them perfectly centered. [← sounds better than “lazy”]
I’ll just rip the seam to one corner, leaving the other corner and remaining stitches intact:

They extend past the pocket on the outside corner by a bit, but I am very okay with that oddity. Now to pin the waistband.

Sew them up, and they’re done! I am content with this result.
Notice how the waistline is no longer straight? Interesting side effects of fabric manipulation.

Sara Hartwin

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posted 2 years ago

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Resource #1
Evelyn Wood’s method of sewing darts is my favorite so far.

(That woman’s channel is chock-full of high quality content, by the way.)

Sara Hartwin

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posted 2 years ago

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Resource #2
This Sewing for a Living blog post explains the back center seam method in detail. The text tutorial (below the videos) is very informative, with lots of pictures.

Here’s the video:

Sara Hartwin

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posted 2 years ago

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Final thoughts & encouragement

I work on an entry-level home sewing machine (Brother LS-590). I have no serger or overlock machine. This alteration is very doable with basic equipment.

A hammer is helpful for flattening and thinning bulky seams before you sew through them.

I recently discovered the arrowhead stitches on my machine. I like them for overlocking raw edges.

A clean machine works better – lint builds up really quickly under that plate! It’s a pretty quick job to clean it out. I don’t have a brush but a Q-tip gathers it right up.

This is one of those projects that I drag my feet getting started, because it's kind of fiddly, with plenty of opportunities for adult-only words. But the end result is so nice, I've never regretted doing it. The anticipation really is worse than the actual doing, for me. It never takes as long as I think it's going to.

I really am looking forward to playing around with darts more, especially on my bodice blocks.

Edited for grammar fix.

May Lotito

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posted 2 years ago

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Well done Sara! The result looks very neat.
Men's pants are made to be adjustable with a central back seam in the waistband and also the order of construction is different from women's pants. I took darts out of the back waistband of my Jeans too but the job was quite quick and dirty I wear tops long enough to cover it.

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Shawn Foster

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posted 2 years ago

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If I had more apples, I’d throw them liberally all over this thread. Great posts, Sara! If you want more dart fun, check out Bianca at The Closet Historian. This video of hers got me understanding darts for the first time, and I’ve been sewing for a whiiiiiiiile.

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Sara Hartwin

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posted 2 years ago

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May Lotito wrote:Men's pants are made to be adjustable with a central back seam in the waistband and also the order of construction is different from women's pants.

I aspire to deciphering a garment's construction just by looking at it, but I don't have the experience yet. Taking clothes apart is so far the best way I've found of learning about commercial garment construction.

May wrote:...I wear tops long enough to cover it.

Yes! Wearing more tunic-like tops (therefore longer) is one reason I don't mind the imperfections.
And the "out of sight, out of mind" principle works really well while I'm wearing them, even if I'm wearing shorter tops. :-D

Shawn Foster wrote:...check out Bianca at The Closet Historian.

Gracious, Shawn - I'm not even 10 minutes into that video, and I've already learned more from her than from the few blog articles I've read.
I was thinking while writing this up: If we're darting, we're basically doing geometry. Like, really real-life doing it, not protractor and pencil and paper doing it. No fancy formulas or constants needed! Just fitting and marking.

Thank you both for your kind compliments!

Shawn Foster

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posted 2 years ago

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Her pattern drafting video series (this is one of them) is so great. The combination of her explanation with the demonstrations actually works in my brain. I can actually make clothes based on my measurements now, rather than buying patterns!

May Lotito

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posted 2 years ago

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Here is what I did. When the waist is too big, it's important to figure out where does the excess ease go. In this case, taking in the side seam or center back won't have the same effect and will mess up with the grains.

P1180994.JPG

P1180997.JPG

Make deeper darts aka original yoke not curvy enough

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Nancy Reading

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posted 11 months ago

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Thank you all for your helpful tips! I find myself in the need for taking in some waistbands. I'll let you know how I get on.

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Sara Hartwin

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posted 1 week ago

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Skill expansion!
I came across this in one of permies' fabulous pocket-discussion threads.
This tip is from a YouTube video posted to that thread.

I expect to be handsewing more in the future. Concepts like this help me shift my thinking from "which hand stitch imitates the machine stitch the closest" to "which hand stitch gets me the best result for a given construction element".
With darts, I would have said a running backstitch is most like my machine's straight stitch - which is what I would have used to machine sew a dart. But I think a ladder stitch probably gets me more control and a straighter line.

So it's not just about pattern matching, but how different stitches manipulate the seams, and how to apply that to get different results.

Dart-ladder-stitch.jpg

Handsewing plaid darts with a ladder stitch lines up the pattern precisely!

Jay Angler

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posted 1 week ago

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Humans are not all built the same way - that helps make us interesting!

Despite not being large, and definitely not overweight, I have a butt that sticks out. This makes the dart approach to adjusting waistbands very useful for me - it gives me the space I need across my lower hips, while bringing in the waist so the pants stay were they belong.

I am prepared with some pants to use a drawstring or some elastic at the back, but that doesn't work with a heavy waistband.

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Michelle Bradley

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Wonderful photos and discussion on darts. But what about the other direction? Just this summer my dad (83 years old) asked if I could ADD "some room" to his favorite gardening pants. Both pairs are beyond dirty and stained, but they were thrifted eons ago, could stand up on their own even after a wash, and darnit, I was going to figure it out. Not easy, as we were at his cabin, far from my Singer sewing machine. I cut off the middle back belt loop. Cut down through the waistband. Tore apart the center seam, so the "V" opening was about 2-3" long. I took one of those denim patches that has pre-glue on one side, that you're supposed to iron onto a ripped knee, and folded it in half, trimming it so when folded in half, showed both on inside and outside the waistline. (Unfolded, it was a large diamond shape.). hope this is making sense. Then, using the toughest thread and sturdiest needle I could find and a "thank God my grandma left a thimble in this little sewing kit prayer of thanks, I hand sewed the folded diamond over the edges of the open V. Sorry I didn't take a close up pic. It could have used a hammer -Love that idea that another person mentioned. I ironed it out the next day, to help keep it in place, but I could have used a hunk of some other thick fabric.

Screenshot-2026-09-02-at-8.27.11-AM.png

Said pants on Dad, as he paints on the porch.

Jay Angler

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posted 1 week ago

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Michelle Bradley wrote:Wonderful photos and discussion on darts. But what about the other direction?

Absolutely! In fact there are two SkIP BB's that fit this:
https://permies.com/wiki/152173/pep-textiles/Add-gusset-garment-PEP-BB
https://permies.com/wiki/151797/pep-textiles/Alter-Waist-Pants-Skirt-PEP#2307219
We tend to call these "gussets" or "godets" rather than "darts", because we're trying to make more space, but the most important underlying principle is that we get more use out of clothing if we make it fit!

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