Any business can be profitable if you are able to control costs and maximise marketing. The Internet has in many ways allowed smaller businesses to compete on the same level as their larger counterparts. While they may have smaller marketing budgets, with quality content and well structured websites, not to mention social media, they can to a certain extent compete with the bigger players. So, online marketing is vital to any business.
It's one of the most lucrative ways to enforce creativity on to your audience and capitalize out of it. Most entrepreneurs that start selling shirts will all sorts of designs on them know exactly where and what the market stands in order to succeed. You can find more on other sites that have made this a reality by providing some really cool matching outfit designs. To me this is one of the most creatives ways to sell clothes and bond people at the same time. I bought the other day a nice matching gear hoodie pair for me and my Mikey and it felt great.