Making clothing water-resistant using spray products available at hobby shops, fabric stores and some big box stores, is easier than you think. People who work outdoors or are planning a camping, backpacking or bicycling trip often waterproof their clothing if wet weather is in the forecast. Wearing water-resistant clothing is a sure way to stay dry and warm, especially in cold weather when body heat can melt that snow that gathers on jackets and sweaters.
Launder or dry clean the garments before applying the spray. Make sure that the garments are completely dry, especially if you are applying the product to heavy fabrics like denim or corduroy.
Spray all parts of the clothing according to the directions on the can. Some sprays require that you heat the item after spraying by either placing in a hot dryer, ironing the fabric at the highest heat setting recommended for the fabric or by blowing a hot hair dryer over all parts of the garment.