Previous experience in this field is key. You don’t need to have a previous job, but a portfolio would give you a boost. If you’ve previously designed men’s apparel, create a portfolio along with your resume to provide to your new potential employer. If you haven’t had previously designed, consider making samples specifically for your interviews. Find local small business to contact, if they don’t have a men's department see if they would be interested in starting one as you would be a great fit for the position and point out that you have the ability to expand their clientele.