Check your OED.
Stentour is defined as stiffening for a doublet.
1502 Acc. Ld. High Treas. Scot. II. 289 For iij elne cammes to be stentouris and patrownis to him.
My OED access was down due to "renovation" of the site (Oh, joy...) Having discovered the new, improved (NOT!) way in & found the answer, I rushed back...too late!
I'm glad I was on the right lines with 'Stenting', though...
...And there's never anyone on the desk at the FT anyway!
Thanks aeronut for the definition. Great to have a closure. Thanks also Lie-in King for where to find the information. I can rest easy now! I new word for my vocabulary.