My wife ain't big (size 8 on a pie day) but she is 20 weeks pregnant and if you look from the front it's obvious but from the back it's impossible to tell and I am sick and tired of her coming home with more tales of being banged and jostled that I'm ordering some high vis vests with pregnant on the back in bloody great letters, don't know if anyone else suffers the same so putting out.
Just checked out www.hivis.net and they reckon for plain yellow it's £3.83+VAT or neon pink £7.13+VAT.
I'm going pink will let you know how it goes.