For me it was more in the plus sizes, something around 20-25 lbs. I've been told that once you get into the regular/misses sizes, it's more like 10-15 lbs. a size. I'm just now into regular sizes (18) but we'll see if that holds true!
"THEY" say that it is 10 pounds (I've always heard that), but that was so not true for me.
I think what the previous poster said is true. Plus sizes have to lose more to go down size-wise. I have noticed that since I've gotten into "normal" sizes, my clothes get bigger faster.
-Sunny