Changes in clothing size?

Kyra
Hello everyone!
I just have a quick question about changing bodies while you're pregnant.
I know thinner women usually go up a couple sizes in clothing when they're pregnant, but I was wondering if bigger gals do too?
I've heard that a lot of women haven't had to buy special maternity clothes because whatever they have fits them throughout their pregnancy.
I'm also wondering about bras.
Did anyone go up in size while pregnant or nursing?
I'm a 46FF and I already have to special order 99% of my bras.
I'm not TTC right now but I'm just looking for information.
Any comments are appreciated. Thanks!