I don’t think this is a dress.
After googling images of it, here’s a complete description, which includes some info already in your description.
Dalmatian Dog Costume - men’s short sleeve, shorts-length onesie/jumpsuit/romper. Features pockets, a double sided zipper, and hood with black ears.
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Updated. TY
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polyester.
Be careful with butane and propane torches when cosplaying with those kinky poodles.
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