I think I want to take the plunge on the white oxford button down (seems like a safe bet to test the Epaulet shirt waters) and wanted some sizing help. I'm somewhere between a small and medium in J. Crew shirts...think I can pull off a medium? Just a little concerned about the chest measurements, I'm measuring some of my shirts and I should be somewhere in the 19" range but I feel like I never measure that correctly. Thoughts? Experience?