A waterproof seal includes a flexible annular tube formed by an inner layer and an outer layer of a garment and surrounding a passage through which a human appendage is intended to protrude. A first cord is positioned in a cavity defined by the annular tube. The first cord has a first end, a second end and extends more than 180 degrees and less than 360 degrees around the passage with the first end and the second end exiting the annular tube. A second cord is positioned in the cavity defined by the annular tube. The second cord has a first end, a second end and extends more than 180 degrees and less than 360 degrees around the passage with the first end and the second end exiting the annular tube. The first cord and the second cord cumulatively cover more than 360 degrees around the passage to provide an effective water seal.