Winter’s thaw is finally upon us. (Hey, if that’s not a cause for celebration we don’t know what is). But before you dive head-first into spring’s phenomenal fashion trends—The cold shoulder! Slip dresses! Wedgie jeans!—know the rules of what’s appropriate to wear to work and what should be worn solely for weekend and evening outings.

Follow these rules on what you should never wear to work, and we guarantee you won’t get called out by HR for improper office attire.

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1. Shoulder-Exposing Tops
From off-the-shoulder blouses, to one-shouldered tops, and even long-sleeved tops with single a shoulder cutout, this spring is all about the sexiness of a bare shoulder. But no matter how high the mercury climbs (or the fact that you’re seeing other women commuting with bared shoulders, we’ve already seen some), just don’t do it. It’s way too much skin for work environment. Now, if you’ve got a date on the other hand, definitely show off those shoulders.

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2. Floor-Sweeping Maxidresses
Who doesn’t love a maxi dress in the warmer months? They keep you cool and covered and yes, channel that inner festival child within you right there in your cubicle.The problem comes when the maxi falls past your ankles, grazing the floor. If you’re going to wear a maxi to work, make sure it hits no longer than your ankles. Anything longer than that simply looks sloppy.

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3. Anything Sheer
Sheer illusion details are everywhere right now, from pullover tops with sheer sleeves, to skirts made of cotton lace with a sheer miniskirt slip underneath. While you may be covered up in the technical sense, it just reads as too naked for a work environment.

4. Cutouts
This may seem obvious, but avoid pieces with cutout slits in the midriff or arm areas (or anywhere else). Covered up clothes can still be sexy, but covered up pieces with flashes of skin ups the sex factor…a factor you do not want to exude on the job.

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5. Anything Your Need to Wear With a Special Bra
A good rule of thumb to play by is, that if you need a strapless, backless, one-shouldered or backless bra to wear your work outfit, you need to change.

6. Thong Sandals
Boy, has the flip-flop come a long way. Today, there are jeweled thong sandals, ones with lace-up ankle strap, heck—even high-heeled thongs! No matter how fancy (or even how expensive) they might be, thongs sandals are inappropriate for the workplace.

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7. Clothing that Can Be Mistaken as Sleepwear
Slip dresses and pajama tops and pants were the  de rigueur for spring 2016—and they’re not trendy this fall. But if you’re office is on the conservative side, save them for date night or brunch on the weekend.