Guest attire: How much say does the couple get?

Hey y’all!
Well. My dad is getting married in December 🙄 As planning has gone on his FW has really pushed my sister and I around and I’m curious if my hatred towards her is tainting my judgement (okay, I’m bored at work too and her most recent text came through this morning and I’m still processing)

The wedding doesn’t have a listed dress code but she’s been texting us lists of rules even though we haven’t asked her input at all.

Also we are not in the wedding party or in any way a part of the ceremony.

Her rules thus far:
Wear clothing that covers all tattoos (for me that’s : forearm, wrist, behind my ear, and upper shoulder) (for my sister that’s :upper back, ribs and wrist)
Shoulder, chest, back and stomach covered (no mesh)
No suits, pants or jumpsuits
I remove all piercing (nose, septum, rook, and tragus)
No black, grey, red, yellow, or green
No books or sneakers under my dress (and no stilettos for my sister)
Floor length or knee length dresses
Nothing tight or fitted
No natural curls, no heavy makeup, no red or dark lipstick, and no dark nail polish

Other rules are:

We aren’t to talk to her family without her or my father around.

We aren’t allowed to drink.

My sister, husband, and I aren’t to speak Spanish to one another around her family.

A few of these rules I already plan to break: I’m drinking and speaking to my husband any way I wish. I’m tempted to just buy whatever dress I want.

Also, yes, we’ve talked to Dad and sent him screenshots and he’s basically said she’s a picky bride and that we need to respect our FMIL.