Stating what your partner can and can't wear isn't boundaries - it's control. and this is where you are missing the point.

As I said before, it starts with small things and escalates. Regardless of gender - I made that very clear in my last comment. Women also perpetrate coercive control.

This person in particular - the female - ended the relationship. Many others don't. You may say: it's their choice and, in part you are right. But because you are judging the situation from the outside, you have no idea how deep the control goes; what the consequences will be if they don't play by the perpetrator's rules. The emotional and mental abuse is often devastating, the victims are left with no money, no self-esteem; nothing at all. In some cases, there is physical abuse as well, but not always.

If you like, I can send you a few links of domestic homicide cases that happened after the victim challenged their partner's power. They chose to leave the relationship and they were killed. Some killers also murdered the children, before the mothers, so they could witness it.

In England, we had for the first time a woman charged with coercive and controlling behaviours (her name: Sheree Spencer) in 2018. There's a documentary about this case; the suffering she caused to her husband was horrific. Why did he stay? Mostly to protect his children.

I'm not having a go at you, but I work in the industry so I know perfectly well what I'm talking about. This man is a (potential) perpetrator.

Again, I would suggest you research a bit about coercive and controlling behaviours (a crime) to help you formulate an informed judgment.

One partner can't put boundaries on the other. Healthy relationships are about negotiation, not imposing rules.