Am I headed in the right direction?... I don't love the polyester, but I like the style, the fit, and the price: https://www.amazon.com/SheIn-Womens-Cross-Sleeve-Skinny/dp/B07WR79NMT
We can change direction too.
Your "friend" is a jerk. Google cocktail pantsuit for woman, and there are lots of alternatives to what she's suggesting. For example, R&M Richards Women's 3 PCE Laced Duster Jacket Shell and Solid Pant https://smile.amazon.com/dp/B079D72PYM/ref=cm_sw_r_apan_i_FC8G41YVF1J1DHG6EPP5
If your friend is that immovable on what aguest wears she doesn't really want you to attend a d/or doesn't care about your feelings.
NTA
Like this one?
Or MakeMeChic Women's Two Piece Ruffle Trim Cami Crop Top and Wrap Skirt Set https://www.amazon.com/dp/B07TDL2R2B/ref=cm_sw_r_cp_api_i_A0EfFbRXXZ9BK
Or
VKOOVIFA Women's High Waist Faux Suede Zipper Back A-Line Bodycon Short Mini Skirts. https://www.amazon.com/dp/B07D9J89YL/ref=cm_sw_r_cp_api_i_w4EfFbA9QSZF0
Amazon is your best bet for something cost effective. Something like this. Pencil skirt and blouse with at least short sleeves or longer. You could get something with a wide tank strap (at least two inches) that has a seperate coat. Wear at least slightly darker neude stockings and grey or black low heels. “Character shoe” style
Marycrafts Women's Formal Office Business Shirt Jacket Skirt Suit 14 Black https://www.amazon.com/dp/B06XR6XVZ1/ref=cm_sw_r_cp_api_i_V87eEbJYCA02F
Please feel free to dm me if you want specific help like to review links, etc.
You can also google “professional White House black market” that’s where most super super professional ladies get their expensive dresses. Look at those and find cheaper clones on amazon or thrift stores :)