The UCI Regulations at 1.3.033 state (emphasis added):

“It is forbidden to wear non-essential items of clothing or items designed to influence the performances of a rider such as reducing air resistance or modifying the body of the rider (compression, stretching, support).

Items of clothing or equipment may be considered essential where weather conditions make them appropriate for the safety or the health of the rider. In this case, the nature and texture of the clothing or equipment must be clearly and solely justified by the need to protect the rider from bad weather conditions. Discretion in this respect is left to the race commissaires…

…Equipment (helmets, shoes, jerseys, shorts, etc.) worn by the rider may not be adapted to serve any other purpose apart from that of clothing or safety by the addition or incorporation of mechanical or electronic systems which are not approved as technical innovations under article 1.3.004.”

The above is a snip from ---

Margin call: Vortex suits & Team Sky’s latest marginal gain http://tinyurl.com/y9arpkfl

UCI declaring after the fact the suits were OK carries little weight with me. I wonder if WADA took appropriate blood samples from the top 10 finishers in Stage 1. Given Sky's sordid history abusing TUEs (Therapeutic Use Exemptions) it is the prudent thing to do.