Whimsical Women's Mad Hatter Costume

The vest panels are sewn directly into the jacket's side and shoulder seams, so they're one attached piece rather than a separate layer you can wear on its own. That said, the satin shirt front fastens at the back of the neck with a hook and loop closure, so it works as a standalone top underneath if you'd prefer to skip the jacket.
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The jacket and pants are sold together as one complete costume set, so they aren't available separately in different sizes. The good news is that the pants have an elastic waistband with a fair amount of stretch built in. A Small waist spans 24" to 30", Medium covers 26" to 31", Large covers 29" to 34", and XL covers 33" to 38", so there's meaningful overlap between sizes that might give you some flexibility when choosing.
(AI Generated Answer)

The jacket is made from velvet with satin panels, so the outer shell itself doesn't have built-in stretch. The good news for dancing is that the pants have an elastic waistband, which gives you real freedom of movement on the bottom half, and the jacket is cut as a separate piece so your arms have room to move.
(AI Generated Answer)