Misleading information

4 Weeks ago I was looking to purchase a costume to take with on holiday. As I am not someone to buy clothing for myself online I opted to chat to a online consultant while busy looking for a suitable costume as I had not found anything instore that I liked. On finding what I was interested in I asked the consutant on the chat if the sizing was similar to clothing sizes. I also asked that if I bought 2 diffenernt sizes and they didn't fit could I return them, I was told that I could return the items if they did not fit. So on what I was told by the consultant I went ahead and purchased 2 of the same items to see if any of the two would fit. On receiving them not one of the 2 sizes I had ordered would fit, they were both to small. I immediately got hold of the Adidas online store to let them know that the items are too small. I was told that I could not return them as their policy states no returns on swimwear. I told them that on ordering the items I was in contact with a consultant during my purchase and not once did the consultant mention that I had to read a policy on returns before purchasing any item. They assured me I could return the items if they did not fit.