Suit yourself means do as you like, though I would not. Fine, suit yourself.
It is agreement with the shoulders shrugged, and it usually ends a conversation rather than continuing one. Said warmly it is genuinely permissive, but that is the rarer use.
1phrasesuit yourselfDo as you like, though I would not.
“If you would rather walk in that, suit yourself.”
suit yourself is a phrase.
Practised in Small Talk & Everyday Phrases