I really think wig-makers/shops should automatically provide their wig-wearers with at least three wigs, all in the same style, but at different stages of growth. Thus avoiding that obvious giveaway - hair that NEVER grows.
They may need to be labelled (inside!)...
1. Just Cut ('Oh, I like
the way you've had your hair done!' 'Really? It isn't what I asked for'
2. Just getting to where you like it.
3. Overgrown Mess.
This would be order to avoid embarrassing mistakes.
Perhaps they could come with a calendar chart marked off at suitable intervals as an indication of when to change wigs. Of course, to be ultra realistic, the wig-wearer would only wear wig number 2 for a couple of days in the cycle, while wearing wigs 1 and 3 for a month each either side of 2.
As additions to the range, there could be wigs such as 'so greasy I can't even answer the door today', 'I thought I'd try that new thickening shampoo but it worked a little too well' , 'ultra visible cow's lick day' etc