Thanks everyone for the feedback.
I agree that a fanny pack would be considered worn and as such any weapon inside would be considered concealed. I can't see how a briefcase or purse carried in the hand could be construed as being worn. Perhaps if the purse was slung across the shoulder someone could make the case that it is being worn.
As far as case law on the "wearing apparel" debate, I am not aware of any. However there are some statements by County Attorneys in Montana that support my position. The following is an excerpt from an article in the local Billings paper:
"There's been some debate surrounding guns in a woman's purse. Is a purse luggage? Or is it "wearing apparel"? If a purse is luggage, then a gun concealed inside would seem to be legal, he said. But if a purse is considered "wearing apparel," then hiding a gun in one would be against the law. The issue is unresolved, but three county attorneys in the state have weighed in on the debate. The county attorneys of Yellowstone, Missoula and Lewis and Clark counties have said that purses are luggage, not apparel, and guns in purses are therefore legal without a permit.
(The Lewis and Clark County attorney who made that announcement is Mike McGrath, now the state's attorney general and a candidate for chief justice of the Montana Supreme Court.)"
http://billingsgazette.com/news/stat...464d52afc.html
Also Gary Marbut who is the author of a book on Montana gun laws
http://www.mtpublish.com/mp/#abtauth and the author of many of Montana's firearm laws has stated CC in a backpack or briefcases is lawful in MT . Mr. Marbut has been appointed to the Governor's Concealed Weapon Advisory Council by two different governors.
Even though none of that stuff I just mentioned constitutes case law, I would feel confident in saying that carrying a weapon in a briefcase inside the limits of a Montana city without a CCW would be considered lawful by the Montana legal system. (not that I am an attorney, just my interpretation from what I have researched)