Hello. Undoubtedly you can do internship in fashion designing. But without doing any course you will not be able to get anything out of that internship. One need to know the theory or the course for the person to apply in practical scale. So learning or doing the course will help you get knowledge about this fashion designing in and out, then you can go for the internship in it. That would enhance your knowledge

Hope this helps

Regards

Nikhitha