I modified the process just a little by leaving the provisional yarn at the bottom of the lining and picking up the main yarn there. So the revised process was:
- Provisional cast on using lining yarn and work about an inch.
- Pick up stitches at provisional cast on. Using main main yarn, work a couple rounds, then work a turning round and work back up to even with lining "fabric".
- Join the main "fabric" and the lining "fabric" together.
- Work the rest of the lining and the rest of the main hat separately.
- Tack the pieces together at the top.