The layerd clothing is a princip of clothing, where you use different clothes like layers of the onion (in german: Ziebelschalenprinzip). One of the advantages is that between every layer air can be trapped and act like a thermal insulator. If you have less, but thicker layers, you don’t benefit from this effect.
Good clothing should fulfill the following functions: Transfer moisture from the body away, keep the person warm and protect from rain and wind.
So the basic tree layers from MHW I am using :
My set of basic layers: Drystein jacket (blue), Solidus jacket (red), Nimba Short Sleeve T (orange)
The Mountain Academy 2 