Apologies if this test has been posted or discussed here before - I didn't find it, but I have seen plenty of discussions of textile vs. leather that I thought could benefit from this information.
In 2007 the German automobile club "ADAC" decided to shred some leather and textile suits, by dropping a crash test dummy at 60 mph in a lowside slide.
Very interesting results - according to this test, in the case of a slide you are better off with $200 leather jeans than a $2000 Rukka...
http://www.endurowanderer.de/pdf/kombitest.pdf
If anybody knows of an English translation, please post it.