The only source I know is from Aviation Leathercraft at
https://www.flying-jacket.com/jacket...attern-jacket/ . E-mail them for details of the 'Identity Brevet - Detachable name brevet with embossed name and rank if required and cast pewter RAF wings.'
They made up some bespoke 'squadron' versions for a batch of 101 Sqn orders many years ago - I don't know if they still do.
In those days their products were rather better than their admin....