Long sleeve Columbia PFG shirts, Columbia water/stain resistant pants, Featherlight Scottevest and closed toe Keen H20 hiking sandals with or without Merino wool socks.
All these clothes can be washed in a hotel sink.
I've been wearing these shirts (have at least 10 different shirts and different color pants) for at least 10 years no matter the mode of transportation. They keep me cool.😎
Featherlight Scottevest for the win.