why would you sleep with them on and then wear them after? I mean, you've got to expext a shirt to stretch out if you sleep in it.

Personally I have a mix of undershirts. Some are the plain hanes tagless, some are some company called "Evergreen", and some are hanes sleeveless (not wifebeaters, just sleeveless) in grey and black...because sometimes white undershirts don't match with what I'm wearing.