Inches are chest size. If your size is not shown, contact email@example.com
Dress sizes are US dress sizes. If your size is not shown, contact firstname.lastname@example.org
If you own a first generation shirt, and like the fit, you might be happy to stick with the same exact size for this fit.
It will be a little more snug, the length of the hem will be shorter, and the length of the (short) sleeves will be a little shorter as well.
A little about the new material…
The new material is a little less stretchy, nearly the same weight you’ve all come to love, more breathable, and should hold up a little better to the friction and abuse we put these shirts through on the regular.