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I'm usually too tired to respond to any threads when I read here at night lol but I wanted to respond to you because we're the same size pre-pregnancy, and I also am all belly (although I've gained 27 pounds so not truly all belly, but it feels and looks like it!). I'm still working out and hiking with the dogs so I had to get a maternity belt to support this huge bump and this is the one I got: [link] (Gabrialla Maternity Support Belt). I bought it in a medium and it's perfect. It's velcro so pretty easy to be adjusted to fit your size.
I will say that maternity belts aren't that comfortable to wear when sitting down; I don't wear mine to work because I have a desk job and I can't sit in it all day. I do wear it when being active at all though, even if it's just light cleaning or running errands. It really helps!
I've heard good things about this one :)