Buy a little more than what you need because 1. More often than not you'll underestimate how much you need and feel like a complete idiot for doing so. 2. Usually you can use whatever is left to touch up or fix things on your cosplay, or you can use what's left on something smaller or takes less or that amount of this item. 3. You can use it as a backup plan it plan b for if you ever run out and need it for another cosplay.
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Geeks Guide to Cosplay
Humortips, tricks, and stuff to keep in mind when making a cosplay I guess
