This is a darling tunic sweater.  Unfortunately it was too for my friend who is about my size.  I'd suggest ordering up at least one size.  This was a gift.  While she loved it, it was simply too form fitting for comfort.  As always, Amazon is great about returns, and PattyBoutik is a fantastic vendor.
I've purchased many, many tops for myself over the years and love her styles.  Each piece does vary a bit in sizing, but for the most part depending on the piece, I can wear anything from x-small to a few mediums.  Usually smalls fit pretty well.  Again, great sweater tunic, just too form fitting to look right even though it needs to be form fitting, if that makes any sense.  Ordering up one size would still fit as intended without feeling restricted.
Love PattyB's!!!