[MISpeedo]

On the Aussiebum website go to a suit style that you like and then click on the suit color that you are interested in; then click on the tab "Garment Care" and it will show you the sheer factor. Examples: WJ classic 2.5 white is High 9/10, WJ Classic 1.5 in ice blue is High 8/10, and Loose 2.5 in ice blue is High 7/10. The higher the number, the more sheer the suit is. There are a few error on their site as I noticed a few lighter colored suits are stated as sheer factor of "Low 7/10" where the "Low" is incorrect as they would be high in the sheer rating (i.e. High 7/10).

None of their suits are totally transparent, but get them wet and it may be what you are interested in.