I’m a bit confused by all this.

Why would a heated suit manufactured in the UK for the U.S.A.A.F. have an Air Ministry Stores Reference rather than an American one?

And surely, if it were intended for use in an American aircraft, whether U.S.A.A.F. or R.A.F. operated, it would be 28v. rather than 24 volts?

My thoughts lean towards a batch of specially manufactured suits, intended for use on a small scale in a British design by the R.A.F./F.A.A., and thus not considered necessary to be in the Stores Vocabulary.

Bit of a wild guess but how about something like the pressurised Wellington VI, intended for very high altitude bombing/target marking? Perhaps this suit offered better protection against the cold than the standard kit of the period?

But then again, what’s all this about:

Electronically Heated Jacket

Just a typo by someone or is this description of significance?