2.
Steampunk
Although Steam Punk really doesn’t fall into costume play we thought that adding a photo of steam punk would fit into this fun top ten list.
Steampunk involves an era or world where steam power is still widely used—usually the 19th century and often Victorian era Britain—that incorporates prominent elements of either science fiction or fantasy. Works of steampunk often feature anachronistic technology or futuristic innovations as Victorians may have envisioned them; in other words, based on a Victorian perspective on fashion, culture, architectural style, art, etc.
This have to be one of the worse posts I've come across here
STICK TO COPYING/PASTING STUFF FROM OTHER SITES PLEASE.
Let them do the thinking for you.
Steam punk isn't exactly cosplay but it is a style within the world of costume play so it's not too bad.