I've tried some footwear! These had a really soft rubber soles, but I've also made ones where the soles were cut from a sheet of hard Vibram rubber: https://self-assembly.fi/canvas-shoes
Your stuff takes it to a whole other level. It makes me imagine a constructible footwear that can morph from a flip-flop (band across foot) all the way up to an all-weather knee-length boot.
No doubt you have already imagined how experimentation with materials and sealing/binding techniques could yield a design system that everyone can make their own; from the multi-spectral La Sape, to baby wear for those fast-growth years, to field equipment for the extreme adventurer.
(edit: fixed broken sentence)
I haven't quite figured out how to apply this thinking to seam sealing though. The current garments that have taped / waterproof seams are locked into the taped configuration. For tents I have some geometrically water repellent structures (that guide the water away as long as it's coming from above), but for the soles of footwear, you might want something 100% sealed.