U.S. Polo Assn.Womens Pajama Set - Short Sleeve PJs with Jogger Pajama Pants…

What is the fabric that these pj’s are made of?

Why does it say 100% cotton but ipon arrival i see it is only 52% cotton?

Imported or made In which country ?

I am a small to medium in womens size. I am 5'4 and 123 lbs. What size would be best so they don't fit to tight?