sayo

smock; doublet

“El resto della concluían sayo de velarte, calzas de velludo para las fiestas, con sus pantuflos de lo mesmo, y los días de entresemana se honraba con su vellorí de lo más fino.” — The rest of it went in a doublet of fine cloth and velvet breeches and shoes to match for the holidays, while on week-days he made a brave figure in his best homespun.

Inherited from Old Spanish sayo, from Vulgar Latin *sagium, Latin sagum, from Gaulish [Term?]. Compare with Galician saio (“robe”). Doublet of saya.