Dressing as Audrey Hepburn in Breakfast At Tiffany's gives you two options: the classic little black dress look, or her sleeping look, which is arguably the better one. You most likely already have an oversized white sleep shirt, and if you don't, you can probably borrow one from someone else or snag an affordable one online. If you have purple tassel earrings, even better — but this is one accessory you'll use even after Halloween is over. Add the appropriate sleep mask, and you're good to go.

While you might not be able to get your hands on Harry Styles’ Gucci pajama set from the actual “Late Night Talking” music video, you can certainly pull off a similar look for Halloween. To dress as the pop heartthrob in his bed-filled paradise, all you have to do is wear a polka dot pajama set — preferably brown if you can find it. From there, layer on a cream blazer, two pinned fake white lilies on one of the lapels, and a large blue beaded necklace to complete the look.

Dressing as one of the Lost Boys from Peter Pan couldn't be easier — or more comfortable. You just need an animal onesie (any will do, although a raccoon is pretty authentic!), and maybe a large goose feather to glue onto the hood. That's it! It also makes a great group costume idea.

Another iconic music video featuring cozy loungewear is Taylor Swift’s “You Need To Calm Down.” To dress up as Swift while she sits on the bed in her glamorous trailer home, you’ll need a light pink satin robe (over a hot pink lace bra if you’re up for more sexy look), pink satin sleep mask (hers says “Calm Down” in gold lettering on it), hair rollers to wear all night, a teal watch, aqua blue eyeshadow, and a Barbie pink lip.

Stay super comfy by dressing as Max from Where The Wild Things Are. A white onesie is the most authentic, but you can really wear any color. Add a paper crown (maybe even with some added faux fur trim if you have time for a mini DIY project), and if you want, a fake tail. Adorable and easy!

This one is a bit of a pun, rather than the actual Disney princess: You're a sleeping beauty, get it?! You can wear any pair of pajamas and fuzzy slippers you own here, as well as a fake tiara and a blank sash — super inexpensive. You can customize any blank sash (or just make one with paper) to write "beauty queen" so people get it.

Another super easy Halloween costume made with an oversized white sleep shirt is Tom Cruise in Risky Business. You just need the shirt, the sunglasses, and the plain white socks. A very popular lazy costume option, but, hey, it gets the job done.

If you consider yourself a “Pharb,” then this incredibly easy pajama costume is perfect. All you really need is a skeleton onesie to embody Phoebe Bridgers on the cover of her hit album Punisher. If you want to take the costume to the next level, you could even wear a wavy silvery blonde wig and carry around a prop guitar. This also works as a great group costume if you want to be Bridgers’ entire band, as they also wore skeleton onesies on stage for the entire tour.

A lot of people like to dress as the Pink Ladies from Grease, or Sandy, but what about Rizzo during the slumber party? It's an iconic scene that deserves some Halloween love. If you have purple pajamas, or just a purple oversized shirt (remember to roll up the sleeves), then go for it! Add a blonde wig if needed, and an empty bottle of wine.

Another super simple Halloween costume that involves only a onesie is to dress like a Beanie Baby. You can pick any animal you want, but a bear is classic (so grab a fuzzy bear ears headband). Make it look more real by creating a big TY sign with cardboard or paper to hang around your neck. This is another great easy group costume idea!

If you have a nightgown and a bathrobe, put it on, add some wire-rim glasses, and voila: You're a grandma. This couldn't be easier. For the full effect, maybe even add some wrinkle lines with makeup.

If you have an old Juicy Couture sweat suit (or anything comparable) laying around, dressing as Regina George's mom (played by Amy Poehler) from Mean Girls is the perfect costume. A stuffed dog really makes it stand out.

This one will probably require you to buy a banana costume (unless, for some reason, you have one laying around). But once you have that, you can just wear it under a pair of blue and white striped pajamas. Easy!

This is another easy one, as you might already have all the components in your wardrobe. Dress up as someone working from home and attending a Zoom meeting — but only halfway dressed. Keep your cozy pajama bottoms on, but then dress the top half in business casual clothing, such as a blazer, chic oxford shirt, and a sleek hairstyle.

You're a mouse, duh! No, actually, you're Karen Smith from Mean Girls as a mouse at the Halloween party. If you don't mind wearing a black silky chemise out, along with mouse ears and a pink sash belt, then go for it. And, of course, walk around telling everyone you're a mouse and that your breasts can predict the weather.

Go for a different version of Cinderella than is usually seen: the waking up in the morning one. Wear a long blue nightgown, carry around a pillow, and put your hair in braided pigtails with little blue bows at the bottom.

OK, all you need here is a nightgown — for the rest of the look, you'll need some Halloween costume makeup for fake vomit and stage blood, and just make sure your hair is super messy.