ihoharv,
I well remember suffering at the hands of that easily-identifiable fella in 1976 - he shoehorned my bonce (beret size 63) into a Medium Broad Mk2 that I had to suffer for the first half of my Linton course. It was only after the 6th or 7th earseal rupture (2 of them in flight) that I was allowed to be re-measured; the superb squippers at 1FTS provided a Large and allowed me to fly without headaches for the first time in months.
...and yes, I had tried changing it earlier but my creamie Fg Off QFI thought that the ex-pongo A/Plt Off stude was trying to make excuses for crap results.