Statue of Winston Churchill near Westminster Abbey. Notice how his collar is turned down?
And I got carried away with this one. Sorry.
Two of the four horses atop St. Marc's in Venice. See their collars? (Probably yokes or harness pieces but
I figure it's close enough.)
The Doctor Who/Torchwood fans among you will recognize Captain Jack Harkness's trench coat
with its broad collar. This is from The Doctor Who Experience in Cardiff a few years back.
And finally, the bright red collars on the Queen's Guard's coats.