Proto-Indo-European *swe-dʰh₁-sk-

→ English custom (derived)

→ English costume (derived)

→ English consuetude (derived)

→ English consuetudo (derived(en/la))

→ English kastom (derived)

→ French costume (derived)

→ French coutume (derived)

→ Middle French coustume (derived)

→ Old French costume (derived)

→ Old French consuetude (derived)

→ Old French coustume (derived)

→ Old French custume (derived)

→ Galician costume (derived)

→ Italian costume (derived)

→ Latin consuesco (derived)

→ Latin consuetus (derived)

→ Portuguese costume (derived)

→ Tok Pisin kastom (derived)