In reply to treforsouthwell:
attaching to the harness via belay loop is preferable as
1) it doesn't deform the harness. The belay loop is an integral part of the design,
some harness can squish the leg and waist loops together, but none of my harnesses
fit that way. (and womens are designed with a bigger 'drop')
2) because of the gap you can get movement of the two parts of the larks head
(I learnt it as cow hitch and larks head !) and hence wear.
Hitching to belay loop doesn't do this, it locks in place.
If your harness does have the 'waist' loop and leg loops tie in touching and they
don't move then it won't make much difference, however i think most /all 2 part
harnesses are designed to fit with that gap.
yes the belay loop is an extra link in the safety chain, but with inspection
and sensible replacement policy not an issue.