My lords and ladies (of any gender), prithee, are you wondering what to wear to the mediaeval and renaissance ball? Fear not. Any attempt at period attire will be admired, and can be great fun, but is not required. There are many easy ways to dress oneself in something apt. See, for example:
https://www.youtube.com/watch?v=XaH6v70h3ys
https://costumes.lovetoknow.com/How_to_Make_Easy_Medieval_Costumes
https://www.facebook.com/Medieval-Mask-Making-1676533352676701/
https://www.youtube.com/watch?v=botZOEBoLDQ
https://nerdilyblog.com/…/easy-renaissance-faire…/
https://www.youtube.com/watch?v=ykhqMydeSdA
Of course, there are diverse merchants who will, for a small fee, attire one.
With the theme of our ball being Rogues, Rags and Riches, you’re welcome to dress in anything resembling Renaissance, Mediaeval or a rogue from any period … with a mask!

For masks, party shops, fabric shops, markets and the like have many options. You can also hire them, and there are many ways to make your own. E.g., see
https://www.wikihow.com/Make-a-Masquerade-Mask
https://feltmagnet.com/crafts/How-to-make-a-plague-doctors-mask-Black-death-dead-diseased-middle-ages-Tudor-times
https://www.youtube.com/watch?v=p6evWdJeIbU
https://www.fleecefun.com/how-to-make-a-knight-helmet-free-template-file/

Satinwood Creations makes beautiful hand-made leather masks. Contact 0428 396 995 or satinwoodcreations@outlook.com.au

There are many other online resources for dressing up in period outfits. Search for something like “easy medieval outfit” or “make renaissance costume”.

Of course, feel free to come in any attire you like, but if you do make an effort on a period outfit, it will be admired, and many people do. It all adds to the fun.