For a man, there are also great Victorian costumes to choose from but it can be a lot more difficult to source these. The majority of wealthy men from that era were known for wearing calf-length frock style coats that were custom fitted along with either a waist coat or a double breasted vest.
Colours were mainly neutral but could sometimes be bright. There were of course many poor men, country lads, grooms, chimney sweeps, road sweepers, butlers, footservants and soldiers. Alternatively, you could choose to go as a professional from that era, such as a schoolmaster, lawyer, judge, Minister of Religion or even a detective!
No one is going to worry if your costume is not totally authentic, so wear what you enjoy, although wearing an authentic Victorian bathing costume or nightshirt and cap might get a little chilly!.