DMC 370 to Cosmo: Thread Conversion

Cosmo 738 is a close match for DMC 370 Medium Mustard, with a tendency toward slightly more saturation than the DMC original. On a small sampler motif the difference is negligible; on a large fill area — a full autumn harvest background, for example — it's worth comparing in person to ensure the mustard reads at the right depth without becoming too bold or orange-shifted.