Especially when you are warm,avoid wearing tight shirts, tops, or dresses. They will rub and make your acne worse. Also, they could spread any infections.
Don't wash too frequently. Overwashing your skin will just wash away your skins natural conditioners and protection, and leave your skin dry and vulnerable to infection.
Having said that, http://www.isabelmarant-shoes.com , DO shower as soon as you can after you've been sweating. So you don't leave irritating chemicals on your skin.