I cast on for Lacecap again today with yarn doubled and used a needle two sizes larger just for the cast on. I did a long tail cast on, alternating the front and back yarns every other stitch. The edge will be more durable and stretchy this way. I also knit the first and last stitch of the cast on together to prevent gapping (decreasing one stitch) and increased one stitch on the next round to get back to the correct number of stitches.