Going trekking in the mountains for a longer time around the world but will also visit a lot of cities for some nightlife and fun but don't want to look like a sweaty backpacker at those times, (even though technically I am one). Let's assume that I'm in the warmer part of the world to avoid the heavier clothing. The city clothes should be able to endure being handled rough in a backpack, be really light weighted, don't require dry wash and have no need for ironing. I also prefer fabrics that doesn't smell after a day of usage. I would set the total weight of these extra clothes to maximum 1 kg. What would you suggest that these "base layers" would be? What is an absolute must to bring? Is it a mission impossible? Shoes is a problem for example as they weigh a lot. My usual style is casual, maybe leaning towards the mod style a bit.