This isn't exactly what you asked but it is the best answer I have ever found about the coat he wore in the series. According to this he thought he was supposed to wear a coat in that episode and he wasn't, but it became a trademark of the series.
The Ultimate Lieutenant Columbo Site
Ron
Quote:
Originally Posted by Jamo
So! You thought I didn't know how to spell, huh?
I meant what I said! I just wanted to know who influenced him on his selection of trenchcoats.
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