got this in a men's small for my son age ...
344515
got this in a men's small for my son age 9 to wear on a disney cruise, it was a big hit with Belle :)
1012446
I wish it is bigger. My son is a 10-year-old skinny boy. I bought size L and it looks small on him. But he likes it and looks cute in it.
3941070
I knew in advance that these shirts are sized small.  I order these men's shirts for my 8 year old.  They really are sized to fit boys (or really really slim men).  That being said....I love this shirt...so much so that I ordered another 3  more (different colors).
1062082
Perfect little sweatshirt for my son.  Runs on the small side, but that is OK cause my boy is petite.  Didn't notice if shrunk in the wash, if it did than it wasn't very much.
3204953
I bought this for my husband ..M is way to small it fits my 10yr old son ..it fit s him great!!!!
2524183
Being that I like my son's clothes to fit a little big so it will last the whole year I think it runs a bit small my son is 9 and he wears between an 8 and 10 the sweater is a Sze 8/10 and it's just right but a bit smaller than I would like
13352
I found out in buying my grandson a hoodie, that a mens small & a youth XL are the same size. So if you need a hoodie or  a jackey or tee if your child has outgrown  a youth XL, move the mnes meduim. I check measurements at various web sites and this seems to be the way to go.  The overall length is almost exactly the same but the mens meduim is about 3 to 4 inches wider than the youth XL. Im very satisfied with the Gildan mens hoodie. made well , will work great for getting the school logo printed on it.
1096633
my son wore the small when he was just under 8 months old.  the shorts were a little big but he is a smaller baby.  he wore the shirt/bowtie by itself under a sweater vest the following month for a wedding we went to.  I was happy with the purchase :)
3441285
As other reviews have stated, It does fit smaller. Luckily I read the reviews before I ordered. My sons uni size is a youth medium, so I got him the youth large. Fits pretty good and the ways it fits him  should be good for at least 2 seasons.
339622
Bought it for my husband and the face to small but we like it anyway gave it to my son.
603356
I bought this for my son, I was skeptical when I bought this, but fits just right on my son. I bought 24 month for his 2nd birthday. He is short and very slim though.
1068730
The size was somewhat small for my son. Lucky he is a skinny lad so it worked out fine.
288220
YOUTH SIZE - not adult... it's falling under men's big and tall but the shirt is for a child.
3933423
My son usually wears a an adult men's size small. He is 12 and big for his age and this t shirt was very small. I think the medium would have even been too small for him. It was very disappointing, since the shirt is very unique and he is a big hockey fan!
2575849
My son got what he expected. It is a smaller fit than I expected. He's a men's small and ordered a small but it won't fit him for long. The arm holes seem high and the sleeves shorter than I'd prefer. I wish I'd ordered a medium.
9389
I ordered XXL for my husband and had to give them to my 10yr old son who wears Boys size 14/16. They are super small for a man!! Aside from the sizing being way off, though, they are a really nice, stylish cut. Good quality, washed well in cold, dry on low. Have washed & worn several times and they are holding up great.
4384987
The color is awesome.  My son does wear size M in boys clothing, and this fits him fine in the chest and sleeve length but it is a little bit too short for him.  He's been wearing it around the house as a test and keeps stopping to tug the hem a little lower.  I think this would be fine as a swim shirt, where you're not so concerned about how it looks, but I can see it's going to drive him nuts to wear as a regular shirt (or even during sports).

If I had been in a store with him, we would simply have gone for the L, but since this was a Vine product we did not have a sizing choice.