OppoSuits is a clothing company founded by Jasper Castelein, Jelle van der Zwet and Guus Bakker in 2012 in Amsterdam.

With warehouses in Holland, UK and United States OppoSuits' products are shipped worldwide. In 2014 the brand won the prize for the Best Small / Medium Enterprise at the Golden Bridge Trade & Export Awards in London. According to a press release, the jury was "impressed by the fact that OppoSuits in just a few years after the start has grown into a multimillion-dollar company that does business with both consumers and retailers in more than 50 countries worldwide."

After starting with an orange suit for Dutch soccer fans in 2012, OppoSuits' collection has expanded to more than 30 designs and is being sold in more than 1,100 stores in Europe, the United States and Canada.