Businesses based in serviced offices in Cardiff may be some of those that are said to be able to benefit from official dress policies.
Charlotte Wolff, an employment relations editor at XpertHR, declared that these ensure "all employees are clear" about what they are expected to wear.
If it is explicitly stated in a member of staff's contract or terms of employment, this would assist in the code's enforcement, she argued.
"It should also be communicated widely to ensure that employees are aware of the policy's existence," Ms Wolff continued.
She pointed out that it is hard to define concepts such as business-casual, so the rules should state what is required and what is forbidden.
Her comments follow the resignation of 24-year-old Melanie Stark, who claimed to have been forced out of her job at Harrods's HMV department after she refused to wear make-up, although its use was stipulated by the company's dress code.
