Why let the truth get in the way of a good rumour?
Annex E of CAP632 (Operation of 'Permit to Fly' Ex-Military Aircraft on the UK register) details appropriate levels of flying clothing, but bear in mind this is for aircraft with a MAUW of 2730kg or more.
It can be found here:
CAP632
So dont panic if you are flying a Piper Cub
