"Petticoat," Greta confirms, smiling a bit easier. "And we already have plenty of those. They might not be the exact length you want, but that's a quick fix." Most of the ones in her collection are a bit long for the job, but she could double them back on themselves a bit and fix it with a running stitch that would be easy to just cut back out once Prom is over. If it only has to last one night, they can get away with cutting a few corners.

"How much longer were you thinking for the sleeves?" she asks before reaching out to examine them, letting the fabric slide between her fingers. Tightening will be easy enough — she's not worried about any adjustments that involve taking fabric away. Lengthening might be trickier, as you can't add what you don't have. She could probably let out the hem a little, but if Regan's looking for several inches, they might need to get creative.