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Pretty sure I've seen some sort of iron on strip, a bit like a suture? I ripped the sleeve on my club jersey and it would be a booger to sew up.
Know what I mean?
[url= http://item.mobileweb.ebay.co.uk/viewitem?itemId=140342057262 ]Iron on hem[/url]
I don't think the iron-on solution works with stretchy material. An attempt to repair a rip on my very stretchy specialized softshell jacket resulted in the iron-on patch falling off the first time I wore the jacket on a bike ride.
How big is the rip? I've patched small holes using neoprene glue both sides as its stretchy and they've held - couldn't see it working for a large gash though. You can get repair tape for fabric, ripstop tape should hold could be overkill though.
http://ripstop-repair.co.uk/products.html
Get some decent quality Duct tape. Put a piece on the inside and use it like a patch to stick the fabric to.
Then medium heat iron on the outside, with a tea towel over the jersey.
Have been repairing ski gear like that for years, and a patch on one of my jackets is still holding after 12 years.
(Including a few washes. .)
As it happens I got my previously mentioned specialized softshell jacket back this afternoon after it was repaired by ZippyStitch in Bromley. They did an excellent job for 12 quid. I would strongly recommend them to anyone who is in reach of one of their branches.