There are a lot of women who exude style, and as far as choosing an icon goes, it all comes down to who consistently dresses well and who has a style that's doable for me. Each of us chooses our clothing, accessories, makeup and hairstyles based not only on what we like but also based on what we can confidently and successfully pull off.
I do see many women on this forum who look fab, so don't think it's all about celebrities. I live in a rural area where, quite frankly, the women don't dress in a way that inspires me. You YLF'ers are great, and make an effort to dress well even if you're just going to run errands or walk the dog. I most certainly admire you, or I wouldn't hang out on this forum so much.
So whether we deliberately choose an icon or simply admire what we see others wearing, I think most of us draw inspiration from someone. I simply lack the creativity to come up with my own original style.