I wear 7M in almost every brand of shoes.  However, I learned over time that with ECCO shoes I wear 37 (which is 6 - 6.5M)  and now I own about six pairs of ECCOs and love them!  BUT, these particular shoes are huge!! ...  They are at least one size bigger, so I'm going to return them and order another size down.  I hope that works, because they are beautiful, comfortable and the quality is great!