I usually wear a size 8.  I ordered the size 39.  They are a bit snug, but I"m hopeful bc they are canvas that they will stretch out a bit.  These are cuter than the pictures shown. I'm not even upset they are a bit tight bc they price was excellent for the shoe.  These are really meant to be party shoes, not all day everyday wear shoes...they have very little support.  BUT THEY ARE SO CUTE.  I will probably order more of the Ava costume shoes...the shipping was very fast, packing was enough but not too much, and the shoes are really nicer and way cuter than I expected.  I'll probably order the size 40....in a very few dress shoes I've gone with an 8.5 before. My pictures aren't great, but I really wanted to show off the sequined details.