One great way to promote your t-shirt business online is by setting up a website for your business. Your website can be your online t-shirt store. This will give customers a place to learn more about your t-shirts, see your designs, and place orders.
You can also use social media marketing on platforms like Facebook and Twitter to promote your t-shirts, and you can even post photos of people wearing your t-shirts on Instagram. Use hashtags to make it easier for people to find your business online. You can also take advantage of online marketing tools like Google AdWords to reach more people.