It's plus sized clothes. I dropped a ton of weight before I went down a size (I was a 26/28 in pants). In Misses sizes you drop sizes faster. It's not you.
Forsythia is right. I was also a 26/28 in pants and it took nearly 50 lbs. to go down one size. The smaller you get, the less time it will take to go down in sizes. I went from an 8P to 6P in jeans and lost less than 10 lbs. Just hang in there. It will happen soon enough.