Question for the professional tree-climbers on the forum: What are safety considerations on using one of these chest harnesses as a temporary attachment point while attempting to layer up in something like the Kestrel? As in, connecting the chest harness, tethering tightly to the tree, then disconnecting the Kestrel in order to add layers. Weight would be on platform, and you would maintain connection to the tree.
http://www.wesspur.com/saddles/chest-harnesses-srt.html
Disclaimer: I don't do this and I'm not advocating it.