Eillet UNDERWEAR レディース US サイズ: X-Large カラー: マルチカラー

Q: Will they hide my belly fat

No. Believe me on this one, because I was hoping for this as well. You'll need some high-waisted thing. This is a mid-rise sort of panty. The picture is deceiving for the height of it.

Q: I usually wear a 12 in pants. What size should I get?

I ordered mine based on their size chart, and it seemed pretty accurate, so have a look at that. It's a little button right next to the color/size choice pulldown. I would guess you would take their size XXL but do check. Don't be put off by all those X's, size 12 is just fine. :-)