Just unlock it. The way to unlock the tailor's shop is simple. After the ordinary shops are built, a blue hedgehog will appear on your island from time to time-Juaner sells things on the island.

Every time she comes to the island, she will go and see what she wants to buy. After you have bought it from her for about two or three times, you can invite her to open a shop on the island.

The next time we meet, she will tell you that she wants to open a clothing store on the island. After getting the parcel, she can choose the construction address and build her own tailor shop.