You can read the accounts of the old Everest climbers in the 1920's, Mallory and Irvine and all that.
For clothing, they tended to wear many thin layers of silk and wool. For footware, they tended to wear full leather boots with hobnails driven into the soles. For cooking, they often had alcohol cookers that didn't work very good.
The Brits learned how to go a long way on kippered herring and a bit of lukewarm tea.