Want to be able to wear flats with a pair of pants one time and heels the next? NO PROBLEM!
For more than a few years now, I have always kept a supply of Res Q Tape in my utility room. When I wore suits everyday, I especially used to to be able to wear different shoes with my pants. now I use it or all sorts of things.
It is even strong enough to use to "hem" up jeans to be worn with flats during the summer. It stays well and I just have to remember to remove it before I throw them in the wash.
I have found other uses for it as well. Have a stubborn belt where the end always sticks out? Use a little tape to keep it down. Getting dressed and suddenly notice a hem on a shirt that is coming undone? Stick some tape on it now and worry about fixing it later!