[Gilderoy's rather puzzled expression tells Sirius that he's not quite sure what one could do with a photograph other than swoon over it.] Oh? You wouldn't throw it away, would you? That'd be such a shame!

[Then, he self-conciously fixes his robes. No one really knows where Gilderoy Lockhart buys these colorful outfits but it's likely the Lockhart's have a private tailor back home. There's some truly garish stuff in there and nothing matches with that awful Ravenclaw scarf! Oh, Gilderoy never disliked anything more than that drab scarf.]

These are boy's robes, dear Sirius! Fashionable ones.