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RAF flying suits
Just like the USAC / USAAF the RAF used shearling suits which consisted of a jacket and trousers. This kind of suit is well known as "The Irvin jacket". The same type of suit existed also in electrically wired version, this means that the suit itself ISN'T heated but the suit had provisions to connect a heated undersuit, gloves and booties on the electrical wire.
Another kind of suit used extensively by RAF personnel is the Sidcot suit which changed a bit until it's final version in 1941. This last version resulted in an electrically wired suit.
In fact, the main idea of the AM was to create a suit which could be worn at all times. The user had to use inner suits in order to obtain his desired temperature and comfort. This could be via a heated waistcoat, a quilted inner suit or a combination.
Underneath you'll find an examples of such a combinatoin as used by aircrew.
Inner Suits
  
Left: RAF quilted kapok liner for the 1940 & '41 pattern Sidcot suits intended to be worn over the Type D heated waistcoat or directly underneath the Sidcot.
Middle: Close up of the label of the inner suit.
Right: Back view of the suit.
Outer Suits
  
Left: Front view of the RAF 1941 pattern Sidcot suit, this is thus a electrically wired suit. A detachable fur collar could be attached if needed.
Middle: Close up of the label.
Right: Back view of the 1941 pattern Sidcot suit.
 
Left: Close up of the 2 female press studs on the legs for connecting the heated booties.
Right: The heated booties which connect to the suit or a heated inner suit from the Type D model.
 
Left: Close up of the 2 female press studs on the arms for connecting the heated gloves.
Right: The heated inner gloves which connect into the studs.
 
Left: RAF Type D outer flying gloves used with the heated inner gloves.
Right: View of the spec-label of a RAF Type D glove.
Combined suit
The fully dressed 1941 pattern Sidcot suit using the Type D heating elements.
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RAF flying suits