If I unlock the hairstyle, can I always go back to Bald in the hair salon for the wigs I have in my wardrobe? Will I always have that hairstyle available so I can go back to it whenever?

yep. you are right. but if you don't want to play with the colours, I recommend to stuff it only into your wardrobe and not redeeming it.

Thank you! :D I just wanted to make sure so I didn't waste any coupons I bought.