Fashion design is a hard job to look for.
You're right that fashion design is a hard job to find. Go to or call your college career office and find out if there are alums in Boston working in the field. Calling them for information interviews would be the most effective thing to do. The next-best thing would be to use the directories in the office to find the names of fashion industry companies in the area. Then, call these companies and let them know you're interested in an internship.