When it gets hot in the summer, I often wear summer dresses. Why dresses? Because it lifts my spirits to look nice, but most importantly though, dresses are comfortable, loose-fitting!
I’ve also switched to sports bras (no bras if the summer dress allows it) and I will never go back. The upside is that they make cute sport bras now and they are truly comfortable.
I can’t handle anything with straps (bras, shirt, or dress) that tie behind the neck or that cross-cross in the back.