I have been eyeing this passport wallet by Nau except it seems a bit thick to me
http://www.nau.com/accessories/landi...oc-808U01.html
The Sea to Summit wallets are also on my radar
http://www.seatosummit.com/products/display/107
Not thin but it looks pretty handy
http://www.ebay.com/itm/270637477012...84.m1423.l2649
Coach outlet sometimes has nice crossbody purses and sometimes they will make them with plain black leather with less flashy hardware.
I have this convertible backpack purse in black leather
http://www.binkbags.com/html/tapered_convertable.htm and since it crosses at the top when you put it into backpack mode, it is pretty secure.
Too bad the Tom Bihn showroom is appointment only tomorrow and Friday, if you're still in Seattle
http://www.tombihn.com/page/001/CTGY/_WHERE They don't offer a feminine cross body or a passport wallet with a coin pocket but they do have clever designs that threaten luggage store addicts.