I never buy or wear T shirts as such but do like Polo shirts so wonder if any companies do those in 3xl or possibly 4xl.
I long gave up waiting for the club to put out some decent designs.
About 5 years ago I started designing & making my own via Vistaprint - it's not expensive and it's ridiculously quick & easy to do.
You can choose whatever image & text you like on a quality soft fitted t-shirt (or loose & baggy if you've got a bit more room to work with!)
all printed & delivered for less than £10
Inspired by the 50th anniversary of this classic British film, this is my latest effort produced a few months ago ;
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http://www.vistaprint.co.uk Be sure to search for a promo code before ordering. There's loads out there and you'll get at least a further 25% off.
Jesus, I believe there might be one lurking in my Dads flat, buried in the spare room, if I find it you can have it. ( As it certainly won't fit me any more)