ὑπόδυμα
From LSJ
οἵ γε καὶ ἐν τῷ παρόντι ἀντιπάλως μᾶλλον ἢ ὑποδεεστέρως τῷ ναυτικῷ ἀνθώρμουν → whose navy, even as it was, faced the Athenian more as an equal than as an inferior
English (LSJ)
ατος, τό,
A tunic, undergarment, IG5(1).1390.19 (Andania, i B. C.): Medic., = ὑπεζωκὼς χιτών, the lining membrane of the chest (pleura), Cael.Aur.TP1.4.