French casquette

← French casque (suffix)

← French ette (suffix)

→ Breton kasketenn (borrowed)

→ Danish kasket (borrowed)

→ Norman castchette (cognate)

→ Polish kaszkiet (borrowed)

→ Portuguese casquete (borrowed)

→ Romanian caschetă (borrowed)

→ Russian каскет (borrowed)

→ Russian кашкет (derived)

→ Serbo-Croatian kačket (derived)

→ Serbo-Croatian качкет (derived)

→ Turkish kasket (borrowed)