Because of the yobbish behaviour by a significant proportion of the younger generation (and some older I might add), it's become quite commonplace nowadays to have CCTV coverage of city centres (we've even got some in Hereford). As a result the hoodie, as a means of hiding one’s identity, has become something of a boon to those intent on causing mayhem. Consequently, the hoodie has now become synonymous with vandalism, thuggery and just plain anti-social behaviour; hence the wearing of them has been banned by certain shopping centres.