It’s summertime. Workplace dress codes everywhere start to relax to prevent people from roasting on the job.

But how casual is too casual? Is it possible to dress for the weather and still maintain your professionalism at work?

“Summer months can be difficult navigate though, when there is ambiguity and when dress codes are relaxed,” says Tami Ballis, vice president and branch manager of professional staffing services for Robert Half.

Just because there may be a more casual dress code doesn’t mean there is now no dress code.

It’s important to maintain your professionalism above all else, it’s always best to lean towards a more conservative choice when you are unsure.

Ballis’ tips for remaining professional:

-Never wear flip flops

-Avoid see through material (linen)

-T-shirts are rarely appropriate, especially ones with political messages

-Never show skin wear low riding pants

-No strapless dresses

“If you work in a professional environment, try wearing light dresses, or a skirts with blouses. Sundresses can seem out of place in more professional environments,” says Ballis.

For men she suggests casual collared shirts and slacks with loafers.

Sometimes the best way to gauge whether your outfit is appropriate is to look towards your neighbor. “They best yardstick to measure yourself is typically the person next to you, if everyone is wearing suits, than so should you,” says Ballis.

It’s more crucial than ever to remain professional in today’s market, according to a study conducted by Robert Half. They found that 80% of executives interviewed said that clothing choice affected an employee’s chance at promotion. So it’s probably best to avoid more revealing yet comfortable clothing and sweat it out this summer if you’ve got you’re eyes on that corner office.