It would've been perfectly cool for a flag print bikini (though it's getting a bit cold for that in my latitude).
There's nothing wrong with the flag print on Ted Nugent's shirts. (Though his popping collars while not being Elvis is a bit of an issue).
Hell, pose nude with an actual flag, so long as you don't let it touch the ground.
(Some of my friends have. The pictures are awesome. I win at life.)
This has been your PSA of the day.