Modelling with a sexual overtone to it. It can include Swimsuit and Lingerie but tends towards the pin-up/poster style. Often of provocative nature.
Having a bust of 34C is the bench mark for glamour models but is not always required.
Glamour can be topless or non topless. It is easier to find work if models will go topless as there is less competition.
Glamour can be most things now days but is associated with glossy magazines, lads mags and top shelf mags to some extent.
The requirements for a glamour model are not as restrictive as other categories, provided the model has the figure for it and this usually means some curves! then there will be work to be found although it is a popular category and competition is fierce.