I will be going to Peru in July and will do the Salkantay Trail to Machu Picchu, but I have no experience with layered clothing (I live in Brazil, sub 10°C is dead cold here). From what I understand, I will need base layers, then non-cotton t-shirts, then fleece sweaters, then a "anorak" (water and wind protection), and finally a rain poncho to help in case o rain. Is that right?
For the pants it would be base layer, fleece pants and trekking pants/shorts, right?
Reading a bit more, it seems that I will need 2 fleece sweaters (200 and 300 something) and combine them accordingly. Is that right or overkill?
The base layer will be needed mostly at night for sleeping (during the day it is about 20° C and at night it goes down to -5°C). Do I need more than one set of base layer (considering a 4 night trek), or just one is enough?
As for socks, I need trekking socks (again non-cottom that is able to breath). Can I reuse pairs every other day?