Able Sisters
From Wild World Wiki
The Able Sisters is the town's designer fashion store. It is always situated slightly to the east of Nook's store. It is run by Mabel and Sable. For the most part using the shop will involve you talking more to Mabel than Sable.
The shop has two display sections. The first is in the centre of the room, and displays eight designs created by a human player. If the human players have not yet created eight designs, the remainder will be randomised designs by "Someone" from "a town". Players (and visitors from another town) can change the patterns on display by swapping or selling their own designs.
The second display section is at the back. This shows the unique game items. Usually there is one umbrella, three shirts, one item of headgear, and one accessory.