Wholesale Organic Dog Shirts

Hi, I'm new to this forum and this is my first post. We have a doggie shirt business and have been doing organic shirts from American Apparel. They no longer do them and we wanted to go custom anyway. Do you know someone who will make us organic doggie shirts. We have the type we want. I guess we need a pattern and then someone to make them. We will take care of screen printing. We'd like to order about 250 in various sizes and then keep working with this vendor. If this goes well, we will do our non-organic with them as well. We prefer to stay in US. Any help on how to get started would be appreciated. We'll work with anyone but we are in Florida. Sorry so long. Thanks.