Hello everyone, I have few questions and wanted your opinions please.

I have an appointment at an oxfam thrift shop that specialises in bridal and I was wondering what to wear and take in with me. I will be going as a guy (never done makeup or wig). My plan is to buy a bridesmaid dress or evening gown, I would ask to try a wedding dress but not buy one and I will make cash donation if I don't purchase anything. I will explain this upfront to the SA. She knows I am shopping for a dress already.

I was thinking of the following:
Strapless bra - black
Double push up bra - black (dont have forms)
Really tight control pants - for good tuck and smooth fitting dress
Tights, black & opaque - I have hairy legs and saving is not an option
High heels - my only pair of shoes

Should I take a different colour bra? I dont have a white one maybe I need one? Also I will close shave my face and I think I will shave my armpits.

Any other suggestions or thoughts?