Hi so I (27F) have been in Germany for almost a year now and I'm working in a senior HR position in a tech company and I've to say that I still don't really understand (female) office wear in Germany.

It seems like it's quite accepted to dress somewhat casual but there seems to be some sort of code behind it that I don't understand.

Are colorful outfits considered unprofessional? I've had a few situations where I got comments like "Du bist aber bunt heute" or similar, are those actual compliments or backhanded criticism?

And is it considered unprofessional to come work with a backpack as a woman? I seem to be the only one.

I've already understood that having my hair in unusual colors attracts negative attention which is why I stop dyeing it. What I don't really understand though is how I should wear my hair, having your hair open seems to be uncommon, at least if it's on the longer side, should I put it in a bun or a ponytail for work? If yes which styles are most accepted for office work?

There seems to be a lot more to those things in Germany than my previous experiences in the US or Norway, so any insight would be appreciated.