We’ve all heard about how great skin-on-skin contact is for developing infants, but I’ve got a better reason to keep your shirt off: baby puke (including simple drool, garden-variety spit-up, and projectile vomit) wipes right off skin without the aid of a washing machine.
If you have to go some place important, put your shirt on as the very last thing you do.
[...] put on a shirt as the last thing you do before leaving [...]