For cold weather measures and blindfolds in the event of a disaster. I bought a disaster prevention goods called "Ben Lee Poncho Emergency Toilet Blindfold" sold by a company called Kenyu.
A black poncho with a hood made of polyethylene. The size is about W165 x H160 cm, and you can keep out the cold and rain by wearing it from your head. The hem expands when crouching, and it is designed to prevent it from turning over, so it is also useful as a blindfold when using a simple toilet.
While it is convenient to cover the whole body more easily than the familiar aluminum sheet as a disaster prevention goods, some people may be concerned about the odor of polyethylene. It may be better to open the disaster prevention goods once and check the usability so that you can calmly respond in case of emergency.
"Benry Poncho Emergency Toilet Blindfold" is sold on mail-order sites, etc., and the price range is around 500 to 700 yen. I think it will be useful outdoors, so why not try it even if you have many opportunities to go to leisure or watching sports.