Due to the speed that technological advances, there is very little growth in this field of employment you will definitely want to get a job working for a fashion designer as they are very specific in their needs. Apply for an entry level position first and get your foot in the door this also includes to consider an internship. Have a portfolio of your best work attached along with your resume. Show your talent and ability to adhere to the demands of the designer and the ability to adhere to strict deadlines. As a seamstress you can advance to a dressmaker, tailor, fashion designer or other related profession.