Women's Sexy Princess of Darkness Costume

With a 36DD bust, your fullest chest measurement is likely around 41 to 43 inches, which runs larger than the X-Large chest of 36 inches. Since this jumpsuit is designed to fit tight and is made from a 94% polyester, 6% spandex stretch knit, there is some give, but the chest measurement is the one to watch here. Compare your exact chest measurement to the size chart to be sure you find the best fit.
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A UK 18 converts to roughly a US 14, which lands above our XL (36" chest, 38" hips), so I'd suggest reaching out to our customer service team via chat or email so they can look into the best options for you. That said, since this costume is designed to fit tight and is made from a stretch knit with spandex, comparing your chest and hip measurements to our size chart is the surest way to find your fit.
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The collar is 100% polyester satin, which is a soft, drapey fabric that won't hold a rigid shape on its own. A quick trick many costumers use is to run a thin strip of craft wire, boning, or even a pipe cleaner along the inner edge of the collar to give it the structure it needs to stand upright.
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A US 2-4 typically aligns with a Small, which has a 30" chest, 24" waist, and 32" hips. Since this costume is designed to fit tight, comparing your exact body measurements to our size chart is the surest way to land on the right size.
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A women's size 10 typically corresponds to about a 36" chest, 28" waist, and 38" hips, which puts you right at our Large. Since this costume is designed to fit tight, comparing your exact measurements to our size chart is the surest way to confirm the best fit for you.
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With a 34" bust, the Large is actually the right call. The Large chest measurement is 34", and since this jumpsuit is designed to fit tight with a stretchy 94% polyester, 6% spandex knit, that snug fit is intentional. The front zipper closure will help you get in and out easily.
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The size chart measurements listed here are the authoritative numbers to use for this costume. For each size, those are the costume's actual dimensions in inches: for example, the Medium measures 32" chest, 26" waist, and 34" hips. Measure yourself at the chest, waist, and hips, then compare to those numbers, keeping in mind that this costume is designed to fit tight, so matching your measurements closely to the chart is the surest way to get the right fit.
(AI Generated Answer)

The size chart measurements listed here are the authoritative numbers to use. For a Small, for example, that means a 30" chest, 24" waist, and 32" hips. Since this jumpsuit is designed to fit tight, measure your chest, waist, and hips and match those numbers directly to the chart, sizing up if you fall between two sizes.
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The collar is made from 100% polyester satin, and our copy doesn't include specific instructions for keeping it upright. A common trick that works well with satin collars like this one is to use a few small pieces of double-sided fashion tape or clear snaps to tack the collar to the neckline of the jumpsuit, which holds it in place all night without showing.
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This jumpsuit has a front zipper.

The skirt is attached to the jumpsuit and does not detach.

The materials of the included items are as follows, Jumpsuit: 94% polyester, 6% spandex stretch knit; skirt & collar: 100% polyester.