Start an ascot pattern by first making sure that you have all of the supplies needed to make an ascot. The next step is the take a neck measurement to determine the length of the ascot.
After that is completed, create a paper pattern to the cut-out to the width you desire. The next steps are to cut the fabric using the paper pattern, place the pieces together in accordance to the pattern, stitch the edges together and then complete the finishing touches. There are a number of ascot patterns available online that include instructions. One online resource is steamingenious.com.