OP from your posts you're on weed, xanax, kratom, adderall and you're a grown man buying your first suit......from express! So maybe you're not thinking coherently
Jokes aside, I have the same issue I wake up morning lean and I really am lean everywhere but also look like I'm pregnant sometimes by then end of the day. I went a long time looking for the cause but honestly it's just my diet, I'm sure genetics plays a role but that's a whole other discussion and not something I can change anyway. I love food, I would rather eat and be happy than to suffer and be lean, fuck it I've just come to grips with it. I'm like you I eat clean all day then at night I'll smash a monster meal from a restaurant, not all the time but definitely often enough to hold me back.
It's your diet brother, you're not lean enough to blame it on anything else. The guys on here talking about bloat are doing crazy disciplined diets and frustrated that they hold some water, that's not you and me. We have guts because we eat bad that's all there is to it. Don't get me wrong I'm not fat I still look better than 99.9% of the population just like I'm sure you do but we're sitting here looking at competitive bodybuilders and people who have dedicated their lives to their diets and saying "hey how come I still have a gut and he doesn't".....it doesn't work that way.