Thank you all for your replies!

Thank God I asked before being impulsive and buying that dress from build-a-bear. Dresses fit her always a bit too wide and they drag on the floor... I hate that! They get really dirty lol... anyhow
Yes, my sister bought from Michael's for Luna!! She got her 2 dresses from there but again they fit her a little too wide. However, my father bought her a doll dress and it fit her perfect! He bought it in Orlando and we're from Miami, so we're going to have to look around to see if they have any similar down here.
Thanks again! I'm so glad that our babies are small enough to fit into bear and doll stuff, let me tell you "yorkie clothes" is so expensive!! I just bought her a shirt that was 23 dollars! CRAZY!