Down 20 lbs OVERALL (pre & post op weight loss) - and my clothes still fit the same. Grrr. I bet if I gained it all back I wouldn't be able to squeeze into them again.
You lost fat but you are still swollen with water. I am 4 weeks off, lost 23 lbs, I can tell in my clothes but my belly is still pretty swollen and hard in places. It will all work out in the end. Don't get discouraged, 20 lbs, you are doing something right.