Me too. 3xl shirts loose but not long enough as well. Horrible size. Can't get a coat because they don't zip up without looking tight. Have to buy sumat two sizes bigger which is more out of proportion. You don't have to be massive to be bigger if that makes sense. When I was slim I had the same problem because of my big arse and chest.
Try buying trousers when there’s a 14 inch difference between your hips and waist. Absolutely everything gapes at the back without a belt unless they are high waisters. I know lots of people don’t like them but they were a godsend and now they’re going back out of style and low risers are in so I’m going to have another decade of not being able to find clothes that fit.
Not a problem for me, I just buy narrow pants and wear them for a few months until they just give in to the pressure.