No I haven't heared of them changing teir dress, but neither would I object to someone asking them.
Beacsue if we are all going to rub along and get along, we all have to given and take.
When I went to Egypt I knew that if I dressed in shorts I'd be treated by many of the men as a whore. Now I'm not, and I would prefer it that they didn't think that way and make those sorts of assumptions. but hay, it is their country, my holidays, I wanted to have a nice time and didn't want to offend anyone. So I took the advice in all the books, wasn't offended that I was given that advice and had a great time and was treated very well.
And the same thing applies here. Our cultural norm is that faces are on show. This is the case and has been for centuaries. This is our culural norm. people do expect to see your face. Now these ladies might wish us not to feel like this, but we do. We do find it odd and disconcerting to talk to a veil, it is our cuture.
I have no problem with them chosing to go their own way, in fact I am proud that our society gives people this level of freedom, but in doing so they have to realise that it will colour the way people react. This is not to condone por behaviour or rudeness to a woman in a veil. But it does make people lok twice.
Just like shorts would have in egypt. asking them is on a par with being advised that wearing shorts can be seen as offensive. It isn't racist or arrogant or stupid.