When it comes to women's clothing and accessories, it is probably fair to say that certain types and styles simply don't cross the age or generational boundaries quite so well as others. In some cases they can make a woman look like 'mutton dressed as lamb', while in others they can turn a twenty-something into a fine impression of an elderly aunt. Two of the few items which are truly ageless and timeless, however, are silk scarves and shawls, and here's why.…