Roman gown (5)
(Other definitions for toga that I've seen before include "Got a cloak for an old Roman" , "Classical garment" , "Got a robe for an old Roman" , "Roman raiment" , "Graph's y value" .)
(Other definitions for tunic that I've seen before include "Clobber" , "Smock" , "Schoolgirl's dress" , "School garment" , "Cut in (anag)" .)