Very interesting. κάλτσες sounds very similar to the Spanish word for socks, 'calcetines'. Easy to remember that way. Greek is so fascinating.
In arabic: Κάλτσες = kal-sat /كلسات (socks) (colloquial) Παπούτσια =ba-bouj - بابوج (slippers - sometimes heavy kind of slippers) not sure but it might be of Persian origin
Damn. Κάλτσες sounds just like the word for pants in portuguese (calças).
I believe that socks (κάλτσες) is linked to 'chaussettes' in French and have an ancient root in 'chalk' and χάλιξ ... Also connected is 'rez-de-chaussée' - the level of the chalked/pebbled earth, ie ground floor.. An English connection would be 'causeway', or a pebble/limestone path built over wetland.