Fashion. For the Ultimate Gambler, her gothic style was one of her more iconic traits and she loved it. The only problem was finding certain tailors that understood what she wanted. She's the Ultimate Gambler, she can't be seen wearing rags that did not fit her certain style. She had to look good and find someone her age who understood her style and how she thought. After an interesting talk with Byakuya, she found you.
The Ultimate Fashion Designer. You worked for all kinds of people, making designs for a princess and even a yakuza. You knew how certain designs fit and how to adapt your style to anyone who came to you for a new outfit. So when Celestia came over to you, you immediately came up with designs for her in your head. It was almost instinct for you.
"Ah, My dear. I'd like to put in a request for a new outfit for me."