These caps were worn at the start of WW2 and were popular at the end as walking out hats. They had a resurgence in the 1960s and 70s in barrack dress and were often worn with blue guernseys. They were dropped in the 1980s and replaced in the dress regulations with peaked caps or berets. They remained in the Dress Regs for Mess Kit but in reality fell out of use.
They were very unofficially worn by a few officers in barrack dress in the 1990s and 2000's but this was not widespread and not approved. I even saw one example being worn (briefly) in Afghanistan in 2013 in Bastion!
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