To keep warm you could just wear another layer under the tights - if it's arctic I'll wear Y-fronts plus close fitting boxers then running tights. Definitely no shorts over tights. Lycra shorts under baggy shorts is just about acceptable IMHO, if the baggy shorts are too short!
Having made my marathon debut over the weekend, I'm now pretty sore, especially my quads. I went for a gentle jog and stretched yesterday but that hasn't really helped. Does anyone have any advice on marathon recovery, what training I should/shouldn't be doing, and how long I should leave it before racing again?