Myth that contemporary clothing is better than 1920s.

The improvements have indeed been minimal (except for boots I'd guess)

Recent research on Mallory's clothing:

"Their layers of wool, silk and cotton was lighter than modern clothing and extremely comfortable to wear
Mallory’s boot was the lightest ever used on Everest
The 1924 Everesters were lightweight specialists who understood their clothing better than most modern climbers
The complete set of garments was field tested on Everest, by Graham Hoyland, the great nephew of Howard Somervell, in April 2006. He confirmed that the replicated garments indeed formed a sophisticated, effective and comfortable clothing system which ‘was perfectly adequate for a summit bid’. Graham Hoyland , Everest, April 2006 "

see

http://www.innovation-for-extremes.org/mallory_myths.html#gear