Simple question: which MP once triggered a point of order in the House of Commons for attempting to vote in their pyjamas?
Answer: Winston Churchill.
Pyjamas also feature in one of my favourite Parliamentary questions:
Commander Locker-Lampson: If pyjamas are a symbol of social superiority, ought they not to be abolished in a democratic war?
For other gems from Hansard see my appropriately named series of Hansard gems.