In my country there's a bit of a stigma attached to those. In slang they're called bögslunga, which would translate to 'gay sling', because in the past, it's mostly gay men that have used them. I don't think I'd use one because it doesn't fit my style and I can't actually remember ever seeing them for sale here. Cultural differences I guess! That said, I don't really mind how they look and I imagine it'd look quite nice paired with a casual dress.
If you want one, you should get one. It's not really up to other people to decide what -you- should or should not like!