Workers consider crop tops, flip-flops and cycling clothes to be unacceptable in the office, while overalls are also banned.
A study of 2,000 employees found that gym equipment, Crocs and hot shorts are also not appropriate.
Other items considered something to avoid in the workplace were vests, sneakers and jeans.
Following the results, a quiz was created to see if you are guilty of a workwear faux pas.
It also emerged that 57% of workers had a debate among themselves about whether or not a piece of clothing is suitable for the office.
And four in 10 have even been questioned by a manager or colleague about their work attire, while 21% have been sent home for wearing inappropriate clothing.
But 64% think their office gets too hot in the summer, leaving 57% struggling to maintain a cool temperature while conforming to clothing standards.
The battle of what to wear
A spokesperson for Andrews Air Conditioning, which commissioned the research, said: ‘Summer and the workplace are always a tricky combo and it’s clear people are fighting amongst themselves over what to wear.
“The survey shows some interesting results on what staff consider acceptable and unacceptable – from dungarees and trainers to flip flops and shorts.
“And if you go to work in your bike gear, many think it’s unprofessional to keep it on all day, just as sportswear is off limits.
“If workplaces were less finicky about temperature, it would be much easier for staff to decide what clothes to wear each day.”
The study also found that 77% lack office attire when working from home, but only 34% dress the same when working remotely as they do at work.
And although 58% try to dress smarter if they need to interact with clients or customers, 38% think there shouldn’t be restrictions on what someone can wear.
Looking “professional” is harder than ever
When it comes to body parts, 45% think shoulders shouldn’t be exposed in an office.
While 49% think open-toed shoes pose a health and safety risk, 53% want to avoid seeing a colleague’s bare feet or toes.
But 29% would gladly wear open-toed shoes during the summer.
The study, conducted via OnePoll, also found that 57% believe traditional office wear will be phased out of the workplace over the next five to ten years.
And 23% of them thought it was already happening.
The Andrew’s Air Conditioning spokesperson added: ‘Work can be stressful enough as it is without being confined to an overheated office all day.
“Different workplaces also have different rules about what can and cannot be worn to look professional, which is more difficult than ever after the remote or hybrid work of the past two years.
“We hope to help take the stress out of feeling hot in the office and as a result be able to focus better on the task at hand and feel comfortable and confident in whatever workers wear.”
Top Items Workers Deem Unsuitable for Men in the Office
- Casual/sporty shorts
- gym equipment
- Cycling equipment
- Flip flops
- A jacket
- A Christmas sweater
- Fitted shorts
- A T-shirt
- A casual sweater
- A polo neck / turtleneck sweater
- A V-neck sweater
Top Items Workers Deem Inappropriate for Women to Wear in the Office
- gym equipment
- crop top
- Flip flops
- Tube top
- casual shorts
- Mini dress
- Mini skirt