What Size Do Sales Clerks Think You Are?

Have you ever had a sales clerk in a department store try and tell you what size you "really" are. For some reason they all think I am littler than I am. So it is really awkward when they try and sell me something that just DOESN'T fit. Awkward! They feel bad because my leg is completely stuck in a designer pair of jeans and I feel bad and a little mad because I told the clerk what size I really was and they gave me a size smaller because that's what size they "thought" I was. Am I the only one who is extremely annoyed by this.