I mean, it's more about code of vestment. Let's say the code of certain workplace say that you have to have your face fully visible, you can't wear anything that obstructs your face, if religious symbols were allowed you can justify yourself with "religious obligation", the "atheist headscarf" was banned from the start
France recently banned the Abaya from schools which is just a long dress.
If only short dresses are allowed in schools because "we need to ban religion" then following this exact logic they could just ban all dresses next.
Following that just make all girls go to school in bikinis because "religious people wear clothes".
In Africa there's tribes with women who aren't even wearing anything on their chest because that's where those women believe the line should be. From a secular point of view would you also accept it if teenage girls started going to school without clothes?
It is dishonest to claim the Abaya is "just a long dress" or the headscarf is just an accessory.
Maybe it can be worn someday in the future like that. But right now it is a religious symbol and people wear it because of specific cultural and religious beliefs. It's that what the law is targeting.
And maybe also in the future people can go naked wherever they like. But right now, we are not there yet but we already understand that it is not right to indoctrinate people into believing women have to go to great lengths to hide their bodies and if they don't do that they are less "chaste".
There is no slippery slope. We are talking about clothes and your completely arbitrary interpretation of what is right and wrong. For which you do not seem to hold any logical moral consistency other than RELIGION BADDDDD
Just hope the 60s and 70s don't come back, I guess? Or not care?
Edit: Okay, I really need to stop posting things right after waking up. I'm sorry; I hadn't read the article. Hadn't realized it focused on those. I suppose my answer still kinda works, though. Partially sarcastically, maybe. Bring back 60s/70s fashions to troll the clothes-banners and expect them to chill? I'm having a really hard time caring about other people's clothes at the moment and don't see why people think they have a right to dress others.
Get a picture and ask enough people to get a statistically significant result. The meaning of a symbols is defined by what people think it means and of course that can change with place and time. Hence in Europe the headscarf would be religious now but not back then.