How to dress for an unexpected work out

The title should maybe say how NOT to dress haha
My sister and I opted for a last minute Zumba class, I should just always be prepared for when I'm at my sisters to stop me going to Zumba looking like this...

It may not look that bad from a distance but the picture is luckily quite blurry, I'm wearing an old white vest from H&M and a black bra that showed through...not a good look.
Black tracksuit bottoms that are a little on the short side haha
And old mens trainers in one size too big!

Hooray for looking super stylish at the gym!