Halloween // Costum help?!

I'm not sure if this kind of post is allowed in this sub so sorry if it's not 😅! I just don't know in which sub I could ask anymore!

I have to get a bridgerton like dress for school purposes and although I love the theme itself in general, it's so hard to find a nice and fitting dress!! If anyone could help me out and maybe recommend some sites or something I would be really grateful