Purple Skinny Jeans

I have a pair of purple skinny jeans that I bought online. I bought them on sale and it was no returns. I ordered an. XL and it says it's an XL on the tag but in reality it is a size medium. I'm guessing it's an Asian size and that is why it is smaller. I have never worn them and the tag on the waist states a size XL but it looks like a medium. These pants are also stretchy.