Hi all,
Here's the Aerti piece that won the poll, thank you again for the wonderful suggestions and all of your votes! I wasn't aware of this fan-created outfit for Tifa, I'm very glad the suggestion brought it to my attention! Here's the cosplayer (whom I believe is the source but let me know if I'm wrong) for anyone who is interested:
https://twitter.com/shirogane__sama/status/1256282025339899905
I hope you enjoy!