MilumiaWomen Button Up Floral Print Split Flowy Maxi Party Summer Dress

How sheer is the dress? Do you need a slip?

So according to the measurements an xl would fit me, but everyone is saying get 2 sizes bigger, which size should i get here?if I'm normally a med.

I'm 5'3" 147lb, should I get a medium or large??

Where are these made?