I think white breeches would look much better than the brown ones. I also think it would look much better if either the jacket buttoned or I had some sort of tie. I don't want to look too manly, though.
The jacket I was wearing in that picture is really nice; it has tails and everything, but it's too small. I bought another one that looks a lot like this:
Except it's black. Do you think that would look better than the other one?