My Little Pony Onesie

Im searching for a My Little Pony onesie like this (https://www.target.com/p/girls-my-l...e/-/A-53335305?preselect=53279825#lnk=sametab), but that can fit these size requirements:
Bust: 36
Waist: 30
Hips: 36
Length: 28
Height: 5'7" - 5'10"
I hope someone can help me find one that fits

Walmart has unicorn ones, not quite MLP, but should fit. I've seen white and gold, rainbowish tie die, and I think purple or pink.

I don't think you'll find one exactly like that in a bigger size than they have there. You might have luck commissioning someone to make one that looks like Rainbow Dash, but it'll cost more.

Try Etsy. They are great for custom items. I've had good experience with BiggBabyBoutique on Esty in particular.

I've never ordered anything from this seller before so I cant vouch for their quality but I stumbled across this on Amazon the other day.

Gen 1 looking unfortunately https://www.amazon.com/dp/B07GF6NBSW/ref=cm_sw_r_cp_apa_xjBZBb6XJJJPT

I wish we could get adult sized products like that but companies cant get licenses for it since I'd wager the IP owners don't want their characters associated with it. So unfortunately we're limited to things made with the "craft" fabrics they do license.