Christa W.wrote a review of Arc'teryx Theta SV Bib - Women's on March 12, 2013
The quality is amazing. These pants are killer for keeping you dry, ventilating BIG TIME (excellent for touring!) esp. since the bib does not extend too high on the chest. The gaiters are perfect.
The highlight: the full side leg zips extend to the wait/chest (secured by 2 snap closures at the top) and allow for a quick pee in the trees. Amazing. This is the best! So so great. I have never enjoyed going to the ladies room more since it's actually easy in a bib.
Complaints: the pockets on the chest are smaller than they used to be (around 5 years ago).
The size small looks super cute (perfect for skiing in-resort. my bum looks cute and they are slim-profile/look reasonable) BUT are kind of tight in the hips for more active pursuits (like touring or ice climbing). I can only wear one heavyweight icebreaker wool layer long underwear underneath.
I tried the M and they were billowy and huge and ridiculous. My bum looked awful (but allow for ample movement!).
Too bad there isn't a size in between.
I am looking for something more comfortable for my very cold and more intense trips (roomy and attractive). Might try Mammut...