Is this it?

CLOTH SHOP

My name is Tom McNulty a man that is well known,
O'er in the city of Glasgow I've got a business of my own.
Down in the old Saltmarket my name is wrote on top,
And I'm doing a rattlin' business in my old cloth shop.

Chorus:
I sell trousers from the cord up to the American tweed,
Petty coats, shifts and blankets and I sell them at a very good speed.
I never sell an article without I get a good cut,
And I'm doing a rattlin' business in my old cloth shop.

A man came in the other day a top-coat for to buy
I showed him one at four and six, "Try that one on" says I.
He tried it on, it fitted him just for the walkin' away,
When I tipped him on the shoulder, says I "For the coat you didn't pay".

He turned around and he looked at me and then his fist he drew,
Doubled me up upon the floor saying, "That's how I'll pay you".
He welted me, he pelted me, I thought he never would stop,
For he was very near leaving a funeral in the old cloth shop.

I'm paying a man ten-bob a week for standing at the door,
Shouting out at the top of his voice to bring them into the floor.
They're going out they're coming in you'd think they never would stop,
For I don't need any cripples in the auld cloth shop.

From: http://www.mustrad.org.uk/articles/smith.htm#songs