To be fair they're nuns, they chose their "calling", being a nun is literally their job that they are paid for, it's a uniform. Whereas Islamic women in those countries that force the burka and hijab on their women force it on all women, that's a distinct difference.
Hence why you don't see a shitload of women wearing the nun "habit" all over Italy or anywhere else the Catholic Church has spread to. This is a dumb comparison OP, priests have uniforms too.