"It's hot. People want to be comfortable," said Diane Schwartz, a certified image consultant from Delray Beach, Fla. "But you've still got to dress for business first."

But how to combine cool, casual comfort with a sharp business vibe? That question has been giving headaches to bosses ever since "dress-down Friday" and "business-casual" entered the lexicon in the early 1990s.

Almost two decades later, "business-casual" is still a misunderstood and much-abused concept. "Casual" has become "sloppy," and business leaders have had enough.

"Business-casual has its place," Schwartz said. "But the guidelines have been very vague, and managers haven't known how to enforce it. So there's been this knee-jerk reaction back to formal business attire."

Dress codes are being rewritten, she said, enforcement measures discussed and image professionals hired to help define what attire is business-appropriate.

No one enjoys the role of fashion police, she said, which is why a comprehensive dress code - with the dos and don'ts and penalties for noncompliance clearly spelled out - is essential.

Dress does matter because how you dress sends a message "about you and about the business you work for," said Lisa Maile, an image consultant from Winter Park, Fla. A too-casual wardrobe suggests an uncaring attitude. Dressier attire suggests "competence, a focus on business, professionalism."

Dress codes aside, common sense is the key to choosing workplace attire, Schwartz said.

"Wardrobe is a big part of your business arsenal," she said. "When you get dressed in the morning, think about where you're going, what you're doing, who you're meeting, what message you want to send and what you want to achieve - and then dress accordingly."

Martina Shaw is in the process of rewriting the dress code for the Orlando, Fla., law firm where she is the office administrator.

"I feel like everyone should know what business-professional and business-casual mean, but everyone interprets it differently," said Shaw, who works at Broussard, Cullen, DeGailler & Eagan.

"We used to have casual Fridays, but a few people went way beyond the realm of casual. They were wearing spandex leggings and bike shorts. And lately we've had issues with people wearing what I consider flip-flops," Shaw said. "Just because they have little glitzy stones on them, doesn't mean they're not flip-flops."

Shaw is working with the firm's partners to draw up the new code. "They just don't want casual," she said.

She plans to be very specific about what is, and is not, allowed. It's easier to enforce if it's all spelled out in writing, she said. "I have a hard time telling someone, `You're not dressed appropriately.' Feelings get hurt, people take offense - it's human nature to defend yourself."

Traditional business attire is a no-brainer, she said. Anyone can do a suit and dress shoes. "But there's a very fine line between casual enough and too casual."