Unfortunately the Old Navy store closest to me does not carry uniforms, so I ordered these polos when they went on sale in my childs size. She can wear a large or XL shirt in Old Navy, depending on the shirt and the material, sometimes she likes a certain shirt to be a little baggier, so I chose to ...order the XL so there would be enough material to tuck in the shirt without it coming untucked throughtout the day, plus room to grow. I ordered white, light blue and red, as well as the 3 set. She tried on 1 and it was super form fitting. Tried on the next one, same thing, form fitting; fit like a medium! Had to take back to the store to return & go to a different store and pay more. Disappointing all around. Last year when i ordered them they were true to size, i dont know why they would have changed the sizing on these.