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
So cool! So, I buy this brand of thin-sole shoes called Xero. Their Do It Yourself kit is a simple Vibram sole I can cut to size, a hole punch to find the right fit, and a long lace that I can tie in many different ways, including as a slipper, or sandal, or greek-style laced-up huarache. Tie style, with different colour combinations of sole and lace make for distinctive personalisation.
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.
Yeah, morphing is really the key idea here. You don't have to make all design decisions beforehand, but can wear something for a while and then make changes based on your needs & observations.
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.