I don’t know what to make of that (silhouette of clothes), either. Maybe a collection, even a spectrum or a repertoire? On a specific occasion, an ensemble. A melange. But unless you’re referring to a street mime in black spandex head to toe, “silhouette” is not the best choice of word.
Do peoplevstill have silhouettes drawn traced of their shadow profiles? You know, as a cheaper alternative than painted portraits. Haven’t heard much about silhouette drawing latelt.