I bought a small/medium and it fits like a medium/large
595135
Very plush and I was grateful it fit larger than expected.  I bought a small/medium and it fits like a medium/large.  It's very comfy and warm!
2313038
I ordered a large and I can fit in a medium but this fits like A small
3156385
I wear a small or medium. I bought a medium and it's fairly tight but has a good length. Good quality made.
4202696
This was way too small and I returned it.  I bought an XL which is what I normally wear but fit like a medium.
447327
I bought a large, which usually gives me a little room.  This fit well (the way I want it to), but not loose; so, go a size up...as many have said.
4898451
I am a US small, but purchased what the seller lists as US medium and it fits great.
2884480
I'm a 35' waist and bought the large, should have bought the medium
4621636
I ordered an XL, and it is more like a S/M
4815123
I usually wear small/medium but this runs very small. It's stretchy but the medium was a little too snug to be comfortable. I like the large.
2132103
the size i ordered was medium. It says medium but it fits like a small or extra small..
1763021
I am normally a small, but I bought both the medium and large and both were to tight as a work outfit
4898798
I'm typically a medium, but based upon other reviewers I bought a small.  It fits me perfect.  It isn't TOO tight, but it also isn't really loose where it would seem bulky when I'm wet.  It fits just right!!
3075818
I'm a small/medium in women I bought a large. It fit nicely but a little long.
3989239
Wasn't what I expected, got a medium and it fits like a small..
1524657
The "medium" for this shirt fit like a "small" in other shirts
1011366
Bought a bigger size just in case because of the previous review so instead of a medium i purchased a large and it fits perfect
3897233
I usually wear medium but I bought a large in this and it was a little too snug. If I were to buy again, I would go one size up