Guide to use aquired or purchased Hair Styles in the Dawntrail Benchmark.
Save your current character appearance in the live Game.
Go to: Dokuments, My Games, Final Fantasy XIV and find the FFXIV_CHARA_XX.dat File with the latest Date. (XX representing the random numbers that will be there depending on how many Characters you have created)
Copy this File into the Final Fantasy XIV Benchmark Folder which should be just below the Final Fantasy XIV Folder.
Rename the FFXIV_CHARA_XX.dat File into FFXIV_CHARA_BENCH10.dat (Any number will be okay as long as its not already present.)
Open FFXIV DT Benchmark character Creator and select the saved preset.
Run the Benchmark!
Note: This only works for the Benchmark. You can not use the now preset Hairstyle to create new characters with said hairstyle.
I hope i could help!