My son wore this to school on Halloween for the costume contest, It did not hold up the whole day. Granted he is a 9 year old boy, but he did not have PE that day and was not running around alot, just your basic boring day sititng at a desk. The underarm ripped out and the back part that held the pants section and back section together ripped apart. It was so bad he couldn't wear it for halloween trick or treating that night and had to go as something else :( I guess if I wouldve had a sewing machine or some safety pins I couldve held it up, but didnt..and I don't think i shouldve had to do that in the first place. This was a REALLY cute costume and fit him really good too. Im very dissapointed that he didn't get to wear it trick or treating!!!