You might also find that your photos will come up quite well with a little bit of editing (some basic things to experiment with are brightness / exposure, contrast, and colour temperature - if you don't have a photo editing program, Windows Photo Gallery is free and does all the above quite well).

When you describe clothes, the best thing to do is think about all the information you can get by being able to look, touch and try on in real life, then try to relate that in the description as much as possible. (eg, some things I tend to include are feel and relative weight of the fabric, inside width of belt loops and so on).