Figuratively, the phrase suit yourself is taken to mean, do as you like or do as you please. Literally, it can mean put on your suit.
“The Dapper Dray. Master said “Suit yourself” So i did.”
Image courtesy of http://history.icanhascheezburger.com/2012/05/26/funny-pictures-history-master-said-suit-yourself-so-i-did/.
Quipster 