As for convention etiquette while cosplaying…
Lots of people are going to stop you and ask for your picture. Make sure to practice a few poses beforehand so they do not catch you off guard. The key is to really get INTO character. I have encountered people cosplaying the Joker who grab people's faces and laugh, and other people cosplaying Jack Sparrow who will steal people's ice cream cones. The more into it you are, the more fun you and the people around you will have.
Please, please make sure your costume is wrinkle free and clean. I ALWAYS febreeze my costumes before use, because I know that I am going to be lurking around a sea of bodies for the entire day. It makes a huge difference for other convention goers, and I cannot stress this enough.
Despite this guideline I have offered, the number one thing you need to remember is to HAVE FUN. Cosplay is an enjoyable hobby that can make you a lot of new friends, and being someone else for a day is pretty cool cosplay.
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