Great topic! I tend to shape my wardrobe based on my current life interests. I work in a professional office so I need nice office clothes, I also love to hike and need sturdy clothes that can get dirty. Plus, we just bought a home with a garden, and I am finally able to realize my dream of urban homesteading (YAY!!), fortunately many of my older hiking things can be worn in the garden.
Having an intention when designing your capsules will definitely help, I do appreciate that you need sturdy, durable fabrics. Looking into thrifting and resales is a great way to stock up too. Sewing is in danger of becoming a lost art, so I'm cheering you on in that art!
Having basic color schemes will make for a cohesive wardrobe but remember to save space for those "out there" items that make your heart sing!
Cheers!