For me loose or comfortable clothes. Even clothes with hole, and that is when you are just inside your home for you not to feel ashamed, lol. People with high blood pressure needs to put on clothes that are breathable. If they will choose to wear something that is sticking to the skin, they might end up irritable. It will even make it hard for them to breathe. Besides clothing, they also need to check their blood pressure and avoid getting angry as quickly as 123. If they know they have it, not even with clothing, they should always remember to keep calm and don't let irritation gets in the way. I agree with cotton and a very thick fabric which I don't know the term. The one clothing the sliding the skin all throughout and will just absorbs the perspiration.