Excellent lightweight top if you want a little extra layer but nothing too heavy. I prefer a fairly loose fit , the sizing days seem quite haphazard , I can vary between an 8 to 12 depending upon style. I definitely prefer a loose fit, I bought a 14 and just recently a 16 in this item which I feel much happier in, but I have kept both. Will be very useful as the Autumn arrives.Would definitely go up a Ecological of sizes but your preference for tightness is a personal choice.