I spent a summer in south India a few years ago during monsoon season. I was fucking miserable in my jeans and shirts until I switched over to wearing loose, flowing clothes made of bleached kahdi (loose homespun cotton) like the locals. It keeps the sun off you and even when it gets soaked it doesn’t cling to your skin, and then whenever the rain stops it dries completely very quickly. Other westerners I met made fun of me for pretending to go native, but they had no clue how effective it was.