Cmd. Riker chooses who has to follow uniform code apparently

Worf had already gotten permission to wear his alteration years ago on file. Ro didn't have permission yet.
Deanna works with civilians, who may not be as open with her if she is wearing a uniform. Again, nothing a little off screen paperwork would clear up
Riker takes a risk to assert his authority with an easy to find infraction to bust her with to let her know he means business.

And Ensigns don't get the privilege of dress code exemptions.
- This and a couple other comments in this thread point to an aspect of Star Trek’s world building that hasn’t sat right with me for a long time. It’s supposed to be an utopianistic, egalitarian future. There’s no scarcity or need on Earth so everyone is supposed to be here because they want to be, out of a love of exploration and scientific advancement. So why is there such a disparity in treatment based on rank? Why does an ensign get stuck with a bunk in a hallway while Captain Picard gets a cushy executive suite? O'Brien at least had real quarters to raise his family in, but they were a comparative closet next to the bachelor Captain's. Doesn't seem right to me.
  All to say that, in my mind, if an ensign needs to stick to a manner of dress, so should an officer of rank. They're all part of the same fleet and deserving of the same respect.

Put on pajamas, check!

That outfit somehow both covers everything and is yet barely decent at the same time.
- The costume designers knew what they were doing:-).
- The essence of sexy.
That's just sexy though.
When grandpa comes out of his bedroom in his underoos.

Another reason Jellico was a great captain. Made Deanna put on a real uniform (which looked great on her btw).

Took a damned long time for me to like Riker again after this.

"Ah yes, a refugee from an occupied and dispossessed people. First thing i need to break her is that religious item she wears"

He was ever likable?
- Well, he was a... friend to non-binary and very binary folks. So, that's something.

Who says they aren’t to code? Maybe they are allowed to implement accents from their native cultures? I mean we are talking about the “woke” starfleet here.

In Worf's case, that is actually true. His sash is a culturally significant item for Klingons, displaying his house sigil for example. The same is true for Ro's earrings though. And since Worf got an allowance, Ro should get it, too (which Picard eventually grants. But Worf never got that remark from Riker).
Deanna however just wears civil garments.
- There also was a bunch of selectivisim going on: by allowing the only klingon in Starfleet, a son of a major house, wearing the sash, and then having him posted prominently on board the bridge of their flagship, was a power move.
Suprised nobody's mentioned it yet but Troi's uniform isn't up to code and Jellico made her wear a regulation uniform.
- I could see Tori being allowed to wear more casual attire as a way to help put the crew at ease during sessions. But as a bridge officer and member of senior staff, yeah she should be in uniform
Nog got to wear Ferengi headgear also

I half remember Worf getting permission on screen. What episode was that?

I'm pretty sure he was wearing the sash from his first scene in Encounter at Farpoint.
- You might be right. I was imaging it showed up during the episodes with his brother.

In the US Army Sikh soldiers can wear their turbans, beards, and kirpan due to those things being part of their religious beliefs. The soldier does have to get permission and a uniform waiver first but that's never an issue.

I would bet Laren's earring is the same type of thing. She's a contrarian so she probably just never put in the paperwork to get a uniform chit allowing her to wear her earring and the others did.

Ro is just a terrible officer is why

I love Ro. She's a great character with based politics.
Terrible officer.
- Makes it all the more frustrating they brought her back a second time.

Let's get Captain Ronnie Cox on board, he'll straighten Deanna out

Riker was a Cardasian sympathizer

Ironic considering Tom Riker was Marquis.
- I can't blame Tom Riker. He must have had a serious identity crisis on top of feeling that his promotion and life were robbed from him. I'd be bitter too.