Green’s Dictionary of Slang

tin flute n.

[rhy. sl.]

a suit.

[Scot](con. mid-1960s) J. Patrick Glasgow Gang Observed 52: We came pourin’ oot, aw jazzed up in wir tin flutes, aw drunk and blocked up wi’ the goofies.
[Scot]I. Welsh ‘A Smart Cunt’ in Acid House 259: Ah cannae afford tae buy a tin flute.
K. Lucas ‘All My Life I’ve Wanted to Be a Barrow Boy’ in Obfuscation News Apr. Issue 20 🌐 He would be able to get his Long Suffering Trouble and Strife to sow on the Pearly White buttons on the old Tin Flute.
[Scot]I. Welsh Decent Ride 33: Ah picks up [...] this stiff-backed cunt ina tin flute, carrying a briefy.