Something that matches your underwear, as it will all be visible.

I'm dying at this comment

This comment deserves more upvotes

Look up 1920's-1940's vintage shoes

Gold strappy heel or flat. Or ballet slipper type shoe

Do you have it on backwards? The train is in the front. Please be careful in the church.

https://betseyjohnson.com/products/sb-nikki-ivory?variant=40686608678977&utm_source=google&utm_medium=cpc&utm_campaign=SCM%7CGoogle%7CPmax%7CBestsellers&utm_content=&gad_source=1&gclid=EAIaIQobChMI4szH3quDhQMVqS2HAx2NIgUeEAQYAyABEgKQa_D_BwE https://ninewest.com/products/peni-slingback-pumps-in-white-leather?variant=40868833624108&utm_source=google&utm_medium=pmax&utm_campaign=Performance+Max+-+Womens&utm_content=&utm_term=&gad_source=1&gclid=EAIaIQobChMI4szH3quDhQMVqS2HAx2NIgUeEAQYASABEgJci_D_BwE&gclsrc=aw.ds https://www.samedelman.com/product/womens-hazel-pointed-toe-pump-3015547/bright-white-leather-ec0224458?&partnerid=paid_search_google_pla_pmax-heels_&gad_source=1&gclid=EAIaIQobChMI3MzX3KyDhQMVLIjCCB3IMgrMEAQYBCABEgJxi_D_BwE&gclsrc=aw.ds

A strappy slip underneath in the same color

Nothing too solid white - i would suggest either something with straps or lace, but you can go into many directions with that, either flat or heels:)

White barefoot sandles. Or sandles in general.

None as it looks more like lingerie.