When one thinks of overcoats for the winters, a custom wool overcoat is among the top choices. Wool, as a fabric, offers plenty of advantages. Custom overcoats made of wool are incredibly warm, lightweight, good insulators, and yet very strong, making them durable. However, if you live in an area with heavy rainfall or rain during the winters, a wool overcoat without a waterproof lining might not be ideal as water can seep through them.