I don't think Barbour is quite 'chavvy' yet, maybe on its way, it's certainly very popular with more urban people around here these days, but at the prices it is, it hasn't quite reached the real chavs yet.
In rural Herefordshire, it's everywhere, too much, but I don't think the chavs would go for the 'farmer look' as that is how it is still perceived generally.
I got a barbour quilted jacket for xmas, warm as toast it is, and it's fairly plain looking, bit of faux leather trim, but ideal for dry winter days. Also got a fleece lined hunters hat, which is superb, keeps me my head (& big ears) dry, and warm in all weathers.
BUT, my best barbour garment has to be a pair of leggings I've just been given by a relative, they must be 20 or 30 years old, and have been used a lot while game keeping, they're perfect for rough shooting, smell just like old wax should, and don't make you sweat, and as they're well worn make me look orsumz.......