100% waterproof clothes are impenetrable to water and moist. Breathable waterproof clothes, on the other hand, allow moisture to escape through the fabric and hybrid clothes utilize both 100% waterproof and breathable fabrics in different combinations.
Sometime during the 18th-century, seamen and fishermen found ways to waterproof canvas clothes using remedies like linseed oil, tar, wax, and paint. These clothes were fairly waterproof and must have been a great improvement during long watches on deck in foul weather.
Since then, more modern types of 100% waterproof clothing have been developed using rubber and synthetics. The disadvantage of impenetrable clothing like that is, of course, that