My 2 cents -- if you're pregnant, its your belly. If you wanna walk around showing your naked belly, its not illegal, but expect raised eyebrows and disapproval from many people around you - just because its not illegal, doesn't mean that its not going to make people uncomfortable. Personally, It kind of makes me uncomfortable to see it, for personal reasons.

Here in Ontario, its perfectly legal for me to walk around topless - same kind of thing in a way - perfectly legal, but socially dubious. I highly doubt that a lot of people would want to see me hanging out for all to view, and i'm sure if i did that walking around the shopping plaza, i'd get more than my share of stares and unwanted attention.

... I'll do that up at the cottage, where theres no one around for miles so i can work on my tan however.