Pony-tails, brown sandals and much-loved penguin T-shirts are out, as organisations move to raise the dress code in IT departments.

The introduction of a dress code for IT staff at the ASX (Australian Stock Exchange) is not an isolated incident but part of a growing trend to formalise the IT work environment.

The director of analyst firm Hydrasight, Michael Warrilow, said a number of large organisations in Australia have introduced similar dress standards to integrate IT into the rest of the business.

"The funky, cool dress code of the late 1990s is out and I expect more organisations to follow the ASX lead," Warrilow said.

"Active resistance to a dress code by some techies shows an IT culture that isn't aligned with the business; why should the rest of the business wear suits and ties?"

According to media reports, ASX chairman Maurice Newman has introduced a dress code for techies – a move that has upset many in the IT department, which has always maintained a casual environment.

However, the ASX was unwilling to detail the dress code or elaborate on how it is enforced with a spokesperson claiming the organisation didn't comment on internal policy.

First Data Corp network implementations senior manager Craig Douglas said: "Our IT staff are expected to look smart or business casual. We certainly don't expect people turning up in grunge jeans or torn t-shirts.

"This dress code has been in place for years and there are some exceptions. For example, it's okay to wear jeans and T-shirt during a major install."