Winter Jackets for Trees

I am considering making winter jackets for trees and am looking for design suggestions. Sizes. Material. etc.

Has anybody in these forums done this before?

Local nurseries sell some for banana trees.
Winters in my area are mild compared to other regions of Canada, but still not warm enough for tropical trees to survive the winter without extra protection. Especially against wind.

So, I was thinking about getting some insulating hard styrofoam (hard board), cutting a groove in it to fit the trunk (for young fruit trees), and maybe even packing some styrofoam pink (soft foam) into it. Then tying these devices around the tree trunks to give the trees added protection against the wind in winter. But I am concerned about humidity. Am I solving one problem, but creating another? Is humidity a concern with this proposed design? As long as I don't wrap anything in plastic, moisture shouldn't be trapped against the tree and cause problems, should it?

Any advice or suggestions?

so, bananas aren’t really trees, and in most cooler weather areas i’ve seen them dealt with, including locally here, folks don’t bother to do too much protection. it’s assumed that the stem will freeze back, but that’s fine because it’ll come back from the ground. have you seen what varieties they have locally? many of those sold by northerly nurseries aren’t that tropical, and can take a decent bit of freeze. they still die back, but are plenty hardy.