Ordered two of these, last minute for my kids themed Christmas party day at the end of term. One was fine, but the other had a hole in the arm where the stitching had come away at the shoulder joint. Very disappointing. I would have returned both, but ended up fixing it myself as my daughter was mortified she wouldn't have a Christmas jumper to wear otherwise. The material is not great, but okay for one-off use. Sizing is generous, and would last for a while if the material and build quality was better. I haven't washed them yet, but don't expect they will fare too well!
The jumper was advertised as age 13. My son is 11 years old of normal build and the jumper only just fits. It will do the job for this year for his Christmas jumper day at school though. The Quality is absolutely fine with great design just the sizing could be a bit more generous.