Sorry for jumping into this conversation so late - been slammed with work.
But I was one of the ones who helped Cabela's develop these waders, and the reason we targeted 3mm is that Cabela's already had a women's wader in 5mm (here's the story that got the process rolling: http://norcalcazadora.blogspot.com/2008/10/crossing-donner-summit-to-go-to-cabelas.html
). My friend and I liked the basic concept, but 5mm is way too much for where we hunt in California's Central Valley. They also had a 3mm in womens, but it had that horrible buckle strap where the buckle falls where your gun mounts. Bad news. So, long story short, Cabela's worked with us to do the velcro strap-style in 3mm.
What I don't know is if they're still selling the old 5mms. And I can't say much about the future except that my friend Sarah and I are still working with Cabela's on more projects.
In terms of your girlfriend, I have one idea for this winter: Cabela's also makes a union suit that's pretty warm. I got it because it has a "girl fly" where you can unzip it at the crotch when you need to go to the bathroom, so you don't have to pull down everything and expose your bare butt. I rarely use it thought because it's far too warm for where I hunt. Probably the only flaw for Maine hunting is that it's sleeveless, so you've got to make sure her arms are well insulated by whatever jacket she's wearing.
Here's a link to that: http://www.cabelas.com/cabelas/en/templates/links/link.jsp?id=0026944912627a&type=product&cmCat=SEARCH_all&returnPage=search-results1.jsp&Ntk=Product_liberal&QueryText=polartec+qrs&sort=all&Go.y=11&_D%3AhasJS=+&N=0&Nty=1&hasJS=true&Go.x=23&_DARGS=%2Fcabelas%2Fen%2Fcommon%2Fsearch%2Fsearch-box.jsp.form23&_dyncharset=ISO-8859-1
And in case anyone thinks I'm spamming, I should say I'm not on Cabela's payroll (though I do have lots of waders now - some of them duds - because of the testing we've done, and I got a gift certificate for writing that testimonial in the catalog). I just promote what they're doing because I'm excited that they work with us - I don't think ANYONE else is making women's duck waders, and precious few even make jackets.