I just bought eyelashes 2 times and it never appeared...just lost 20 gold :(
You can have that refunded if you really bought it twice.
It should appear the very first time - I can check when you're on today. If you want to check yourself, keep in mind that you can try patterns - for all purposes this behaves the same as actually buying it, with the exception that only you can see it, and that it's reset after some time.
