Moto GP Racer
Join Date: Apr 2007
Location: Los Angeles, CA
Thanked 700 Times in 601 Posts
Feedback Score: 10 reviews
If you are not an off-the-rack compatible size, making a compromise of fitment will decrease safety. There is no replacement for trying on a suit in person - you can't know if there will be too much or not enough space without it on your body (preferably with back protector on).
Custom made is both a good idea and can be reasonable in cost, though if you want custom and kangaroo it's going to get pricey. While kangaroo is nicer, they use it mostly so they can make it thinner, so that it doesn't necessarily protect more but is more comfortable to wear. You're not giving up much if you go all cowhide in that regard.
Try to find a local business that deals in custom leathers, it's difficult to get what you want if you have to transfer measurements to a shop and hope for the best.