I have just adapted sock weight patterns to lace weight. I generally increase the stitches cast on by about 25%. If the pattern is 60 stitches I cast on 75. You do have to know the number of stitches in the pattern repeat and fudge a few stitches one way or the other. So far I've knit lace weight socks on 0 dpns. I just bought a set of 00 and would probably increase the cast on to 80-85 stitches depending on the pattern.
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