Manchester's outerwear game is STRONG. The boys up there have been on that since day one, its not fashion for them its staple. Apologies for the pictures, only had my phone at hand...
Some of the stores worth checking out if you ever make the trip...
Oi Polloi is an obvious starting point. Tooooo many good brands to mention and the next 12 months for these guys is looking mammoth.... 
Bags of Flavour is a mix mag of a shop, stocking some great vintage and deadstock pieces from 80's sportwear to 70's workwear. Clocked some nice Troop gear, Mountain Equipment, Adidas, Carhartt plus more...

This store doesn't even need a name, located in the Northern Quarter stocking vintage Ralph, Champion, Woolrich, Lacoste, Pendleton amongst many other noteable brands...

Thomas St Post Office are holding it down nicely with the streetwear and casual gear. Brands include Staple, Undefeated, Carhartt and Gourmet... 
Wild card entry is a spot called Afflex Palace a sort of multi floored street market but again some amazing finds can be had in there. Peeped some killer C.P Company, Berghaus and L.L. Bean.
It needs to be said that all the staff in all these stores are a credit to Manchester.
Bun the night out though, admittedly I went to the wrong place but walking through the street was like a Girls Aloud 'make the band' competition.
Thanks to C.S and family for the guided tour and great company.