Wow, yeah my parents have seen me wear my collar when I sleep. Like my dad barges into my room to open the window, and I know he say my black, nylon collar. Like a few times, I don't think he really cares but I don't think he'll let me wear it elsewhere when he's around because he would think that it's informal. Same with having my phone around when I eat. I don't think they've seen me with my collar since summer but I'm sure my dad came into my room in like 5 a.m. When I'm like in the middle of a dream. 
I think they've seen my second, blue nylon collar but not my new one I got last week... 
Either way,  I doubt it that they will allow me to wear it anywhere else,  as long as they are around. The mall,  make schools a good place but I wouldn't get there any time soon. Because I'm busy now.