Instructions
Clear out a space in your character's letter inventory. If you do not have a free space, Gracie will not be able to present you with the badge, which is actually a "certificate" on paper.
Go up to Gracie and begin speaking with her -- this is done by tapping her with your stylus. She will start telling you about herself and her love of fashion. She may also make a comment about how well or badly you dress.
Keep talking to Gracie until she gives you a pop quiz. This quiz is all about fashion and you must give the "right" answers for the badge. Select the first option for every question, even if you disagree.
Collect the certificate. Gracie will tell you that you earned the Fashionista Badge and it will go into your character's inventory. You will also receive a present with the badge, which may be an item of clothing.
Keep talking to Gracie if you want a "makeover." Gracie will ask for a donation to make you over -- this can be any amount of money, or bells, the game's currency -- but if you give over 5,000 bells, you will receive a Gracie original shirt design. Everything you are wearing before the makeover will go into your character's inventory.