Let us start with undergarment.
We search black strap-on stockings or stay up, a thong and a bra.
If you wear filmy underwear, you will get more points. Also for underwear of leather, rubber, (sheer) latex, PVC, or a shelf cup bra you get gets more points.
We have time. You can look for the undergarment in different shops.
Remember: Every piece of clothes you will wear is selected by your partner. It would be nice if you choose some clothes without your partner. So that your partner doesn’t know which clothes you has choice. Then you exchange your selected clothes in the changing rooms.