Cool as in 'hip and trendy' or cool as in something for this weather. If the latter, I would have thought a denim penicl skirt would be the last thing to wear. I was in there yesterday and I bought this . I'm 5'1 and a size 18 and I'm still not convinced it doesn't look like a maternity dress but it is thin cotton and the sleeves are ok. I was going to wear it with cropped jeans (sorry ). They had some nice long-ish linen shorts if you're after shorts.
this is fitted on the norks but has gentle skimming over the middle, which is nice... bit dairymaid, but I have to say it is cool, easy to wear and doesn't cling... available in red or black and white I think, I got the red to wear with linen trousers.