A Muslim immigrant may completely misread a woman's clothing through their cultural lens. They come from a society where only specific types of women dress, what they view as provocatively in public. There's a good chance they might mistakenly assume she is sexually loose, a sex worker, or actively seeking male attention. Her presence might be seen as an invitation.
For example; I was born and raised in England. My people have lived in England and Wales for hundreds of years, although I have lived in the U.S. for near 55 years. I'm still very much an Englishwoman. I live and breathe England still. The England as I left it.
What I'm trying to say is; moving countries doesn't change the way you think and act. It doesn't change your culture.
Maybe they thought the girl on the train was 'up for it' or worthless & disposable because she was all alone, or not covering up enough in their mind. Leaflets and lectures are NOT going to change that.
Meanwhile, I'm sitting here wearing a tweed skirt, a blouse, cardigan and sensible shoes, because I grew up in the 1950's England. I've even changed this area to resemble my 'natural habitat'. Many decades ago I planted English oaks, beech, maples, etc to resemble where I came from. It's not easy as I live in a dry hot climate, so I have to irrigate.
Where and how we grew up remains with us for life, believe me.