Store Manikins

So I went into the Gap to find a pair of PJ bottoms for my lady. I saw a pair that I thought would be good on a manikin in the store. However I could not find them anywere else. So I asked the sales clerk whether they had any in stock. She said that the only ones they had left were on the manikin and then she asked me what size I wanted. I wanted to see the mediums to which she replied, "oh, I think the one one the manikin is a medium." After actually checking it, she said, "Nope that's an extra small." I was pretty obious that it was an extra small because I have seen very few people small enough to actually fit in those. Pretty typical.