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How to make a cosplay that won't fail
First, find out if there are any upcoming anime conventions in your area, and be sure to write them down on a calendar or in a journal.
Plan well ahead of time what anime character you want to cosplay.
Be realistic.
Don't cosplay a gundam wing mecha when you only have 2 weeks before a convention starts. Too many cosplayers wait till the last few weeks, or days before a convention to start their cosplays.