That is a foolish risk. The technology industry in particular is rife with misconceptions about dress and achievement. The new media has its roots in a culture of outsiders who don't care about appearance, and whose disdain of conformity and rules is a badge of honor. Women have achieved great success in new media careers, but if women continue to buy into that culture of outsiders who don't care about appearance, women's success in business will be hurt. How you are perceived in the workplace has a subtle, but significant, affect on how you and your work are judged.
Women can increase their professionalism by dressing as a professional.
That is hardly why men do it. The successful men I know dress in business attire because they recognize the proven value of a professional appearance in business. Women have to get past their issues and emotions about what they wear to work. Women need to act on the fact that appearance is a differentiator in business, and use this knowledge to their advantage. It is much easier, and much more comfortable, for women to deny that appearance counts.