Try Carl Stuart in Ossett. Can get made to measure or off the rail. Costs vary on what cloth you get and they are made at the factory just down the road
You could always try Des Merrion in Rothwell. He might be a bit far away but he's a proper old fashioned tailor. Not cheap though. http://www.desmerrion.com/
Have to say (a) if I had the spare dosh and (b) if I ever wore a suit, I'd support somebody like that. A proper craftsman.
Yes - just had a rather posh looking overcoat made by these guys and they are excellent. Wear this coat all the time now, its great. If its cold on Satdi I'll be wearing it then. So you will see how posh I look. just look for the tallest smartest good looking bloke in the stadium - that will be me. Because of my height I cant get a decent looking coat to fit that's off the peg - so I usually have them made. Its either have them made - or I get them from 'Little House of Horrors' or I just wait until the circus is in town.