Slim male teens (i was one, i actually am still a teen (a tiny demographic on lemmy it seems) and slim, but nonbinary now (but that doesn't actually affect my clothes sizing, as i have not done any biological transitioning yet)) have the inverse of this issue: trousers tend to be too big at the waist and hips if you're slim, so almost all options are either too wide or too short. Seems like these big brands are pretty damn stupid (and evil) and only consider median people (by designing everything for them only) and fat people (by labeling fat people stuff as not fat people stuff in order to manipulate fat people into seeing their brand positively).

also the way this page presents information reminds me of Create mod's Ponder feature