by buying it from the owner
a wig shop or a Disney store and if you get one take care of it AND DONT BRUSH IT
No, you can't dye a synthetic wig with hair dye. However, a synthetic wig can be dyed using paint from an arts and crafts store. The wig will take up to three days to dry after applying the paint.
a store where you can get wigs
There are many wigs shop online. But finding the reliable one is tough. I would recommend you to take service from Expressbeautyonline. I am suggesting this wig store from my own experience. I have bought the human hair wigs from this wig store. In the USA, the wig store offers free shipping. Their expert advice amazed me. In selecting wigs in your choice, you can take expert advice. Again, discount was also available.
There's no reason to unless it's glued on; it's best to take it off & store it properly.
Look for wigs on Ebay. Or take a wig from a wig store that is the same color and style it yourself. www.wonderlandwigs.co.uk also do some good quality anime and cosplay wigs. Or standard wigs in a rang of colours which you can then style.
at a store or mall
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you'll find one at a costume store!!
You can get human hair at any wig store. If you want hair extensions you can get them at a beauty supply store such as Chatters
One can purchase a short wig online from Wig Show, Wigs UK, Light In The Box, Amazon, Wig Store UK, e-Wigs and Best Wig Outlet. One may also find new and used short wigs on the eBay website.
If a wig has synthetic hair, you can't do much but finger-comb & store it on a wig head at nighttime. Don't treat it like human hair & don't sleep in it. If the wig is human hair, carefully comb & brush it as you would your own.