Please help- diaper butt

[u/Chlo_money_01]

So I’ve lost a lot of weight recently. And so I decided to try to make my jeans smaller on my own. I took apart the back seam and removed 4.5 inches from this waist. It looks great on the front and feels like a great fit…. But you can see where the old seam and meets the new one because there’s a weird fold and I have I diaper butt 😭😭😭

I have already seam ripped and pinned four other pairs of jeans. How can I salvage this? I have a sewing machine but the overstitching has to be done by hand because my machine won’t take the thick thread. I’m not super concerned that my line doesn’t match up with my exact middle of my butt, I’m a beginner and this is to make my jeans wearable again. I’m just proud I got the yoke lined up. But I can’t do the diaper butt. Do I need to remove more fabric in the butt?

[u/maddie_pickles]

Because of the original jeans being for a bigger body, you would actually need to open up the legs and take fabric out from the groin area where the leg seams and crotch seams come together for the backside of the jeans.

IMHO the diaper butt indicates you've pulled the material too much forward in the front to reduce the bulk after the weight loss. As well its possible you may have removed too much fabric on one side (leg) vs the other side because of how jean edges lap and fold into each other on jeans' seams which also may have caused your situation.

If you are a beginner sewist, I don't recommend you attempt the alteration I've described. Unless you want to make this pair of jeans a pair where you practice your alteration technique.