(I accidently brought two back tail, and I only need one, so I’ll try my luck here. 😊)

The tail has two butons on the last picture that was meant for the dress (look on reference-link).
But you can use the fabric as a shoulder shawl/cape (you can sew it on your dress’s shoulder sleeves), or perhaps, you can use it as a veil with a small crown to a vintage lolita-themed wedding. 🥰