Countess I'm at the age now where I just chuck on anything and get on with enjoying the beach/swimming pool 
My DH once said to me (and don't tell him I think he's right!) that when you go on holiday/day out/pub/club or a party...you'll see people of all shapes and sizes just enjoying themselves and having a good time.
What's important is that we have a good time no matter what shape or size we are.
There's plenty of time to worry about how we look when we get back home...but for the love of God don't spoil a holiday/day out by worrying 