Phalanx looks... lost over this remark. Instead of just blindly mimicking Robin's expression, they seem to have actually caught the fact that they're doing something that Robin finds funny. They look down at themself to try and figure out what it could be, but just don't see it.

"Sew half of it...?"

At least how they'd managed to tie themself into such an impenetrable fortress of rags is made clear, now.