I actually have a pair of the Draggin Jeans. They are not too bad, they just fit very differently. I had to go to the next size up than I normally wear to make them fit right. Otherwise they were so tight you could tell what religoun I am!!!!!!
Get some real riding gear. Road rash is no laughing matter and it can easily go all the way to the bone. I'm never going to ride wearing the typical Harley uniform again. Look at FirstGear or Joe Rocket for some good stuff that won't break the bank.
I have a pair of the Draggin' Jeans. I think they are sized like most jeans, but the kevlar patches are sewn in after the jeans are made, so it fills in some of the normal waist and butt area. I wear on an odd waist size, so the next even size up fit me perfectly.
Standard they just have the kevlar patches on the butt and knees. On the knees it extends from above your knee to about the middle of your shin (so that if the jeans get pulled up it will still cover the knee area). You can get velcro armor that clings to the kevlar parts of the jeans. They are comfortable jeans that I wear all day at work when I ride to work...