When you bought that fabric you paid for the front side and the back side.. Use whichever side you want.. they're both yours!! I've done that many times... sometimes the back side is softer and prettier.
Once I made a Hawaiian shirt for hubby, and a matching dress for me.. (can you tell how long ago that was?) I had the hardest time keeping the back side out.. you know we always put right sides together. That's the biggest problem you have with using the back side!