This is a great lightweight shirt. I wear a light tank top under it - its perfect for those coolish fall days. I like that it is very lightweight and soft. More like a shirt than a jacket.
I have these from past years and love them. I ordered the blue this year and found it to run bigger then in years past so I returned it. The color was also very close to one I have from a previous year. The shirt is so soft and is very comfortable. I would recommend not sizing up on this. I thought maybe it had a slim cut and it would run small, but it doesn't.
I've been ordering from LLBean for years this is one of the best things I have purchased. It is so comfortable and washes up great! It is roomy enough to layer under it without feeling to snug.