I know in the past when it was illegal to wear anything below the shoulder in non-wetsuit swims, everyone would roll down sleeved trisuits beneath their swimskins and then pull them up in T1. Not a huge deal, but it inevitably costs a few seconds jamming one's arms in the sleeves and zipping up. I haven't had the chance to test myself or observe what others have been doing, but after I started paying attention I saw a pic of a pro at Chattanooga who wore the complete/zipped sleeved trisuit under the swimskin.

Shoulder constriction aside, has anyone had a chance to test whether a tight-fitting, sleeved trisuit is faster/slower in the water? Will/are pros wearing them completely zipped up in swims now?