Order up a size if layering
922181
Great Columbia quality but didn't fit like those in the store.  No room for layering. I usually wear a s/m but this med just barely fit. Returned
3722615
I ordered up a size because the reviews said it was very small. I would suggest not doing that. I will be exchanging for my normal size
4225697
Jersey fabric clings so it is better to order one size up if you are undecided.  I am usually in-between small and medium and I ordered a medium and it is snugg in places but still flattering.  The gray is pretty.
2724068
I own these in 4 different colors.
Great layering piece.
Run smaller than ther clothing items. I wear 4 in the wonderslim pants & small in other tips, sweaters and jackets but need a medium in this particular shirt.
1480145
Glad I read the reviews and ordered a medium. I generally wear small or x small so unless you want it skin tight, size up!
158372
This is a really light layer that is very warm.  My only complaint would be the fit - I'm very small up top and usually buy xxs or xs, but this xs is pretty tight on me.  Because it's white/cream colored and so tight, I don't like to wear it unless under something else, which is a shame because it's such a cute top.  My recommendation would be to buy a size up from your usual.
2224149
The fit is small and I went by measurements. So get the next size up if you choose to order this one.
2680522
I bought this shirt strictly for layering. I see some reviews where women were purchasing to wear alone and that's fine, But they were dissappointed how thin the shirt is.  But to me its perfect for what I purchased it for. With that being said these shirts do run a little small. I actually bought a white one of this same shirt in a 2x, which is my normal size, and found it too be too snug. I can still wear it but I just took a mental note to order a 3x on the next one. So that's what I did with this one in black and it fits alot better. If you want the snug look order your size or order a size up for a better fit. Now if you want to be quite loose then you should order 2 or 3 sizes up, seriously!  That's if you're able to anyway. I will be ordering other colors because I like the color variety they offer. And I love how the sleeves come past my wrists a little. This shirt is on the thin side and it shows all your  lump and bumps you may have Lol!! But again I bought this shirt for layering so to me it's fine. So with that being said is why I give it 5 star
534949
Just order one size up, I am L and I ordered XL and fit perfect!
2532484
Not a bad shirt, but they run small.  I'm usually good with a lg/xl but had to get a 2x for it to fit right.  Order up!
1508819
Love the design, and this is GREAT for layering since it is essentially a breathable layer, but jeez, it's tight. This is a bit more than fitted, so if you have any fat on you at all be careful. You can't just order the next size up because the sleeves will be too long - these are made for lean guys.
2501509
Great for layering.  Will be used as an easily packed and carried insulator as it is light weight enough to easily compress.  These do seem to run small.
4189633
Really LOVE this jacket. Doesn't keep you very warm, but it's the perfect layering jacket. I recommend getting a size larger than normal if you want to layer because it can be a little snug around the shoulders. It just depends what kind of fit you're looking for. Make sure to look up your selected color separately on google because not all these colors match the actual look.
4673926
Go a size up.  Normally wear medium, ordered a large.  Still a little snug.  But it looks good.  Really like the style.
617805
Most of the reviews suggested ordering up which I did but the size up was slightly big. I decided to keep it anyways.
1979549
Ordered a bit large and it ran true so it is a little big but great for layering.  Warm for cold ny weather!
3223637
I went one size up and it was still too small.  I wear a medium usually and I ordered a large.  If I order again, I will go two sizes up.