I tried on a couple of button downs at both Club Monaco and J Crew today and they were really nice. You have to be a little careful with the J Crew ones as I think you want the more 'starchy' version rather than the softer ones. Here's one at J Crew that is so cute:
http://www.jcrew.com/AST/Brows...../92724.jsp
It doesn't look very fitted on the model, but it actually was on me. (maybe that's my body type).