If the sweat pant elastic is too tight to lower the front to “do your business” then you bought them a size too small.
WELL... That seems to be a common theme / answer, but:
1) ALMOST invariably, if I buy them that loose, they are way too long for me. I guess my legs are a bit shorter than average, and they definitely seem to be getting shorter as I get old! Looked at it another way, while I’m hardly obese, the lower half of my body IS a bit on the stocky side, mostly (but not all) muscle and a bit thick boned, it seems.
(I haven’t figured out what guys considerably thicker than I do, and there are PLENTY of them, but, then, I don’t see a lot of actually heavy guys in this type garb - probably cause they can’t find it to fit them! Which is funny - those in most need of sweatpants / joggers find few are made for them!)
2) If they ARE that loose, they tend to “work down” on my waist a bit, which I really dislike...
3) The whole “doing my business” becomes uncomfortable. Maybe my “hose” is placed lower than average? Bwahahaha!