To save, press alt and prt sc together to screenshot. You then can find it in your downloads/file explorer. If you can't find it there, go to pictures and then screenshots. The clothes don't have a adjust feature, so try to do what you have. (too many buttons) Blue is the crewmate and red is the impostor
The hats and clothes are draggable. Just note that the hat or clothes might change, so click it until it is your fav again. When you are finished, and want to screenshot, click the green finish button. It will hide the buttons so you can screenshot.