As to clothes, pants with good elastic waists. I just hope that Velcro shoes don't become extinct. Shoes aren't the easiest thing to get at a reasonable price in Canada. Finding Shoes are trying to find a needle in a haystack, at times.
As to other things, that aren't clothes, what needs to be back in 'fashion', is to treat people with more respect, no more hate (hate isn't needed), manners, Peace, Generosity, Take proper care of others in need, Only take what we need, and so on.
I am not perfect either, but we need to do a lot better.