When I train or race XC, I wear what would considered a roadie kit. When I'm fun riding my mtb and want extra pocket storage, I just wear mtb baggie shorts over a pair of roadie shorts or bibs. I find that quality bike shorts/bibs are so much more comfortable than liners sold with most baggies. For instance, I buy Troy Lee Designs shorts as a "shell" (w/o their liner) and wear my road ones under instead.