Jet does not inform customers and customers losses money

I bought swimwear for my kids. Ages 1year and 2year. They were not with me at the time so they could not fit it at the shop. When at home me and my wife fitted the swimwear on them but it was to small. When I wanted to return it they showed me the back of the slip that says we can not return swimwear. My issue is they never told me this when I bought it. I know underwear can not be returned but was not aware of swimwear. If I knew this I would have never bought the swimwear. I lost R340 I can not use the swimwear. They need to inform people about this no one reads the back of a slip. Jet just lost a good customer ever mouth me or my wife bought something from jet but we will take our money and support a different business. Wil not recommend jet to anyone