As far back as the early 70s, the backcombed bush with a widows peak and quiff was an integral part of his image. This makes it difficult to determine exactly when his baldness started.
As far as I remember, it was only when exposed as a paedophile during several court appearances that 'monster' Glitter revealed his true hairline.
Since his shaming and subsequent exile to the far east he has experimented with various looks, including this 'Fu-Manchu' bald 'n' beard combo.
He is now back in England and regularly disguises himself when out in public. This ginger wig is one example.
A couple of years ago he took inspiration from Rolf Harris.
More recently, he has been spotted wearing a hair piece that makes him resemble an old lady.
I will leave you with this odd video of Glitter going mental in his jail cell, taken from a Channel 4 'mockumentary' about his fictional execution.