[Rin thinks she can see where Sayaka went wrong here. Well, one of the ways.]

Normally you would save embellishments like that for after the dress was already complete. You'll need to start over, after you've cut the materials.

[Ms. Exposition is Rin's standard mode, but she looks apologetic at least. Sorry all your hard work has gone to waste, for however long you were at it... Oh! Rin perks up, turning the mess back around.]

Oh, but we might be able to save most of the fabric still, so there's that.