Needed some new jeans over the weekend - I am about a 27"-28" waist. Most shops (in the big city shopping mall I visited) had only jeans in the 30s" and up- i.e. too big. I eventually managed to find some 20s in TX Maxx - about 10 jeans in that range, squeezed on the end of a rack catering entirely for 30-35s.
Then later I had to take a couple of pairs back as I didn't realise they made were of that horrible stretchy denim which ends up falling down my arse after walking for 5 minutes.
Same with tshirts - I used to be a Medium, now modern Mediums are far too large and baggy, so I've had to shift to Small. As usual, the vast majority of clothes racks are taken up by Mediums and Larges.
Only thing I can think is that as people have gotten fatter the clothes industry has shifted to cater for that. As for online shopping - had far too many problems to buy clthes onlines, esp if they're made for the US market... think I'd be a XX Small there. 😂