How to Join in the Round Invisibly To join in the round invisibly, cast on one more stitch than your pattern calls for. Then, when you’re ready to join in the round, slip this extra stitch to the left needle. Using the working yarn and the yarn tail held together, knit the first two stitches together. Now drop the tail and knit as you normally would..
Invisible Cast on for Lace: The main problem with casting on for lace is the difference in elasiticity between the cast on edge and the rest of the fabric. Stitches worked with any openwork pattern will always stretch more than the same number worked in stockinette or garter, and the traditional long-tail cast on is too firm to accomodate the extra stretch during blocking. ~~ See Eunny Knit! March 2006