I can wear this raincoat. Can I wear it when traveling? I am a boy. I'm 24 years old. Is it still appropriate to wear it now?

Just be practical. Travel is a time to relax at will, without worrying too much about the details of the equipment. Especially this kind of daily use is rare. When traveling, you can make full use of light and heat. Rainy days, especially mountain climbing and outdoor activities, raincoats are more practical than umbrellas, and this one is also very energetic to wear.