The fashionista had come through in designing an adorable dress for Applebloom. The filly had scrapped together the bits have a dress made for Stone Mane's visit to Ponyville. In particular the filly planned to wear it to the River Bridge Square Dance that was coming up.
So, on the day Stone Mane began his train trip; Applebloom dropped by Carousel Boutique for the final fitting. Once that was accomplished she headed into town with Sweetie Belle. As they chatted Applebloom remembered when Rarity had been helping the filly style her mane and pick out an outfit to wear when she had her photo taken for the colt.
Especially since Applebloom had been left with the impression that her friend Sweetie Belle had previously modeled all the outfits on the rack. However Rarity assured the earth pony that specific outfit had been intended as a custom order for a very small mare. Now Applebloom is uncertain of that statement.