We found a good trick for slowing the traffic. My little sister did a thing with the pony club where you took your horse to paint all the muscles and bones on. Took him for a hack after, fully painted, the looks we got were fantastic!
Just a thought though, I wouldn't want anyone younger than late teens to wear one out hacking. There's some VERY odd people out there who might see it as an invitation.......
I borrowed one the other day that said "Does my bum look big on this?" when I went out as rear escort on a kids ride...it worked! Everyone passed very wide and slow! I just need to buy one for myself now, bearing in mind that I'm built like a very wrinkly stick insect.....
I'm not sure I'd want my 11 yr old wearing it - but she is usually escorted by my husband on his bike. Either this one or the one in the post above might be quite funny. Wonder if I could get him to wear it......