Open a locked style in the Hair Salon and you'll see it on your avatar with the full color controls, so you can set your shades and decide before spending anything. Buy it with sP (or use its item) once you're sure, and it's yours to wear and save.
I found out a few glitches, including a redeemable hairstyle which isn't actually redeemable because of the item's rarity, I hope this helps!
This is great for those who still use the salon. I have lots of unlocked styles but gave up years ago because it was too much trouble to choose, place, arrange colors.
Wow this is fun! I always felt like the Hair Salon was a bit inaccessible and this makes it way easier. Love it!