Garter works wide so is there chance you need to work some increases after that to keep the basketweave to same width? (Would need 12 inc to go from 59 to 71. Sounds like quite a few.) What is the st rep on the basketweave? Blocks of 3 sts, 4 sts? You can ascertain the number of sts needed by calc'ing the repeat. OR...
Is the 71 supposed to be 51? 59 less 2 bo's of 4 (59-8=51). Just a thought.
What is the garment? Sounds very boxy with little shaping.