Hi GG
This is taken from the rulebook:
9.1 Competitors shall use no aids other than a cap, goggles, nose clip and costume, which may be a wetsuit, for open water swims.
9.2 A wetsuit may consist of up to three separate parts. The wearing of wetsuit leggings only, gloves and/or socks is not permitted. The maximum permitted thickness of material is 5mm. This maximum thickness also applies to any overlap of material/s.
It's believed that wearing socks and/or gloves confer an advantage in the water as they can give extra propulsion as they effectively increase the surface areas of the feet and hands. Now you could argue that modern wetsuits confer propulsion advantages with catch panels etc, but as they aren't (as yet) banned they are allowed.
What you can do is to have some footwear handy for when you get out of the swim and to run to T1 in. What you can't do is have someone hand them to you - that's outside assistance. In many tris where the exit from swim to T1 is rough the RD's will often advise you to make sure you have footwear available for this. But I'd always check with the RD or BTF Official to get clarification at the event as some may, others may not - it's discretionary.
Edited: 14/06/2012 at 11:53