Maybe try Duluth stuff? My jeans and sweatpants are from them, they got pairs that are made extra stretchy too (for jeans anyway, sweats are innately stretchy…I think?)
Not sure for other sorts of pants, I don’t really wear anything other than sweatpants usually ehahehahegh
As for shirts I have no idea (unless you like baggy tees that make you look box shaped (their main market is like tradie workers and shid so their shirts aren’t very shape, at least the ones I’ve worn (they’re like the only company I know from my wardrobe, everything else is thrifted mysteries))
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Human growth is linear across all 6 axises
It's like when you grab the corner of an image and hold down Shift while you stretch it out
Not sure for other sorts of pants, I don’t really wear anything other than sweatpants usually ehahehahegh