My secret for pattern drafting? Old Christmas wrap. It has a one-inch grid on the back that is perfect for sketching out ideas, pins go through it (and fabric) without a hassle, and it folds neatly to be stored in a manilla envelope.
Here's my rough-and-ready draft of Dave's doublet -- at least the main body of it. Hopefully I'll have a muslin done tonight for him to try on.