Yes I've seen the clear straps on women skaters at the Olympics. It looks tacky.
Skaters at that level should just have their dressmaker build a bra into the dress - then you don't have to worry about it! It's extremely easy to do while constructing the dress. You can add one in later but it's not as easy. Honestly, anyone who is having a dress made should discuss this with their dressmaker - I always make undergarments apart of my conversation with the client.