When I went to primary school in Australia throughout the 80’s, girls were expected to wear bike pants under their school skirt especially for PE. You could get them in the school colours to match your uniform. And we still can get bike pants in school uniform colours today.
It’s not a new thing at all. But it is a new thing to make a big deal of it and insist that it is somehow damaging for girls or it’s somehow sexualising girls to care about their modesty (in the same way that I would protect my son’s modesty) by covering up their underwear.
How is simply making it easier for someone to not show their underwear sexualising them or putting it on them to police sexual predators and perverts? It’s not.
I can tell you right now that no one that I knew (including myself) felt or expressed that they felt sexualised for being expected to wear bike pants. I don’t think it ever occurred to us to link modesty to sex. At a young age we didn’t even know what sex was and that’s the way it should be.
However, there are plenty of children’s clothing for girls that are sexualised. It really became noticeable when I needed to get my daughter shorts for summer and all of them were tiny shorts with no length in the leg part. I had to buy shorts from the boys section just so I could find shorts that were appropriate for an activity at camp where they were wearing a harness and had to protect her legs from chafing (summer in Australia is often too hot for wearing long pants). Why were all the shorts for boys not only more modest than the girls but more practical and durable too?
Your husband is being a normal parent and is not being unreasonable or paranoid. If he noticed men perving or leering at your daughter, good on him. He was doing a good job supervising her. And good on him for handling it by communicating it with you and wanting to make a practical change to protect her. That’s what parents do. That’s what I do as a parent. And even though I am a woman I do have eyes and I have noticed whenever a man or men have looked at children in a predatory, sexual way. It is obvious.
Most people that I have known in real life can recognise it too regardless if they are male or female. To not be aware of something so (unfortunately) common is to not only be naive but either completely oblivious or stubbornly in denial, or very well aware but wanting to gaslight or groom people into trivialising or minimising predatory behaviour.