Team Estrogen: www.teamestrogen.com
This is a great site to find a wide selection of women-specific cycling clothing. Specialty headings on the site include winter gear, women's plus sizes, and pregnancy styles, none of which are easy to find. They usually have some great steals on the Clearance page. Customer service is very good. They also have a great, free forum and bulletin board which has postings from all over the country. Check it out!
Terry Bicycles: www.terrybicycles.com
Terry Bicycles was founded by Georgena Terry, a legend in the bicycle design field. She got fed up with having to accept uncomfortably fitting bikes. So she built her own. And the rest is history...
Despite the name, this site carries a ton of other things from bags to jewelry, with a fine selection of clothing to boot. They too, have some items in Plus sizes and for pregnancy. Not the cheapest place on the web, but excellent quality and really superb customer service makes it worth it to support this very female-friendly company. Case in point: last year I asked the phone rep if they had a particular bike hoodie in other colors. After finding nothing on her computer, she told me she'd call me back. She actually went back in the warehouse and found one for me (the size sample, no less)!
Chicago Wig: www.chicagowig.com
I have no idea where the name came from, but this is a locally based initiative that specializes in customized messenger bags, lock covers, ding pads (to keep your ride looking slick), etc. Several sisters and their s.o's have purchased from them.
Sierra Trading Post: www.sierratradingpost.com
This place specializes in closeouts, discontinued items, and seconds. You can find awesome bargains on all sorts of things, put particularly on winter gear items. This is not a bike specific site, but it's useful to bikers.
L.L. Bean: www.llbean.com
World famous for customer service, this site specializes in outdoor gear (think hunting and camping), but has some bike specific stuff and has loads of things that make biking more comfortable in the clothing department.