These little shirts seem well made enough and the sizes are true.  When worn as undershirts, they show at the neckline with lots of clothes so they're not the best undershirts for open-necked styles.  My four-year-old has sensitive skin and synthetic leotards aren't good for her.  She wears these little tops on gymnastics day along with leggings and either a dress or long shirt on top.  Then when I pick her up from school, I just have to take off the top layer and she's ready to tumble.