When I meet someone new, a few will ask after, or at least mention my kilt; not many, really, but a few. Others say nothing despite the fact I caught them doing a double take or quick once-over and I know they are curious;
That is my experience also. I find it more so in shops when i am the customer, they don't want to offend a customer and try to act really calm and normal.

I guess it comes down to personalities as to whether someone will comment or not.

I used to try to break the ice by some comment, but my wife kept complaining that I was "trying to draw attention to myself" so i stopped doing it.

As I've said before, kilting is a lesson in human behaviour!