S.R.
I always have good luck at Janie and Jack. Their clothes are expensive, but they are the cutest around and the quality is superior. They have a bowtie and vest right now. Here is the link.
http://www.janieandjack.com/shop/dept_mixandmatch.jsp?FOL...
Also try Baby Gap, The Childrens Place, Gymboree, and Macy's.