I've hesitated to editorialize about fashion because fashion is personal. Moreover, I'm on the other side of 40 and don't shop the trends.
Styling is key. If you want to shop the trends and wear them right, there are a few resouces that I recommend, some obvious and others that might surprise you (they surprised me).
Lucky is the best source for styling and deconstructing whole outfits.
While InStyle focuses on celebrity fashion, its Great at Any Age feature provides advice on how to wear a look in your 20s, 30s, and 40s. The looks created for women who are older than your age group won't look frumpy.
I've noted that the Wall Street Journal has expanded its lifestyle coverage to the point of launching a weekend edition and even a Wall Street Journal Weekend TV show on the Fine Living TV network. WSJ articles summarize the trends and how to wear them, analyze the market, and feature the expert views of people in the fashion industry about the durability of trends.
Another surprising source for styling is the fall Newport News catalogue. I had long thought that the Newport News catalogue was tawdry, but I am impressed how it's been redesigned as a "magalog" (magazine+catalog) featuring fashion trend reports, styling tips, and different color stories.
You'll find sites that link to Lucky, InStyle, The Wall Street Journal, and Newport News through a search of The Style Page. We have also added new content to our Fashion pages - don't forget to update your bookmarks!