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in my experience, for some reason the swrve shorts have a different cut. I have no idea why. You might get better mileage out of buying the regular fit trousers and cutting them down.
Another option could be sizing up until the top block fits and then wearing an elastic belt like the restrap one (which is shockingly great).I have a friend who swears by Marks and Spencers elasticated chinos but he's built like a rake on a diet so ymmv
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They're not cycling-specific, but I have some denim shorts from COS that are holding up really well.
Bought them a while back, these look equivalent https://www.cosstores.com/en_eur/men/shorts/product.rolled-up-denim-shorts-charcoal.0796150001.html
Just got some swrve shorts and they are a bit tight, like trunks tight! Any recommendations for tailored bike friendly shorts for the ample buttocked giant?