The request comes after a dispute about Tina Maze's long underwear. The Swiss ski federation protested following the Slovenian's second-place finish at a World Cup super-G in Bad Kleinkirchheim, Austria, nine days ago.
The ski federation confiscated her underwear, but later said it passed permeability tests. Still, the federation recommends racers not wear such clothing because it might contain plastic parts that prevent the body from breathing.
Ski federation President Gian Franco Kasper says: "We have to change our rules. ... It has to be made very clear — if (underwear) is plastified, it is forbidden."