Just because we'll be spending much more time out of the house this summer than we did last year doesn't mean we're completely ditching our comfy vibe. Sure, fancier going-out pieces and—gasp—heels are slowly starting to enter back into our outfit rotations, but I think I speak for everyone when I say that comfort is still our top priority. The trend that I'm unpacking here feels extra relevant right now for that reason. It's easygoing and unfussy but still has that cool factor to it.

Enter the trend I'm dubbing summer sets.

In lightweight fabrics like poplin and linen, these duos are defined by two pieces: a button-down shirt with long or short sleeves and coordinating shorts that are somewhat inspired by boxers. Almost as soon as I was aware that these sets were becoming a thing, they suddenly proliferated and started popping up everywhere I looked. Spot them on fashion-girl Instagram styled with cool basics like ribbed tanks and even worn as swimsuit cover-ups. Obviously, the idea is that you'll be wearing them together, but like all good matching sets, each piece is easily styled solo, too.

To see all my favorite shorts sets in the market right now, just keep scrolling.

All white is such a vibe.

Shop the matching Oversized Linen Shirt ($25).

You've probably colorful shirting all over your Instagram feed—it's *the* trendy basic of the summer. "Honestly this is my new favorite shirt. I wish they still had the green color because I can't stop wearing the yellow! It's so cute and flattering and the fabric is really lovely. If you're on the fence, COMMIT.

Definitely runs large but I love the oversized vibe. Makes me feel like Diane Keaton ready to walk the beaches of Rhode Island."—Madewell Reviewer

Pretty Yellow Stripes. "These shorts are so cute and comfy as well. The cotton is crisp and the fit is true to size. I was concerned they might be too short but they are just right.

I'm usually a medium in everything at Madewell and that was the size I bought. I also got the matching top and it's such a cute set!"—Madewell Reviewer

Very into the idea of styling this set with a cropped tank top, crew socks, and fresh sneakers like Claire's outfit above.

Now that's a summer 'fit.

Beach cover-ups have never looked so cool, if you ask me.

This color, though. Shop the matching Open Work Knit Shorts ($46).

All about this pretty blue hue. "As soon as I put them on I knew I'd be keeping - light, comfy, and not fitted so airy, and of course pockets!"—H&M Reviewer

Royal blue is so stunning. "Another classic! I might be able to wear this to work since they say business casual so let me see!

Comfortable and classy, this linen line is legit cool."—H&M Reviewer

The "dad" vibes are strong, but it works. Lightweight and comfy, these are great for summer!($20).

How can you look at this buttery hue and resist? I know I can't. "I'm in love with this trio! Wrinkles easily, but perfect summer glam look without being overdone.

Mix and match easily depending on the weather."—Commense Reviewer

Another day, another trippy print fashion girls will lose it over.

Loving the color-blocking here.

Steal this styling idea for casual summer outings. Shop the matching Plisse Sleeveless Top ($99).

The colors these sets are offered in just keep getting better and better.

Here's how to wear all those bra tops you invested in last year. "Very cute set. It fits perfectly. I love how big it looks without looking frumpy."—Forever21 Reviewer

A funky print like this is basically begging to be complimented.

Just saying. "These fit perfectly with a tiny bit of extra room so I’m not constricted at all. Absolutely adorable with the matching top!!"—H&M Reviewer

Doesn't get any easier than these.

The perfect oversize fit. Shop the matching Boxer Shorts ($58).

The kind of thing you can lounge at home in and still feel cool wearing out. Shop Matching Tunic ($108). "I really love this shirt.

As a larger straight size or a small plus size, I find that I usually have to choose between something tight or something that drowns me. This shirt is right in the middle and it's great."—Universal Standard Reviewer

Such a pretty texture. Shop the matching Top ($32).

Pretty! Shop the matching Shawn Shorts ($88). "The silk material used in this set is top-notch and feels incredibly soft to the touch.

The fabric is lightweight and breathable, perfect for those hot summer days! The short sleeves and shorts also make for a comfortable and relaxed fit."–—Amazon Reviewer

Up next: 25 Cheap and Trendy Things I'm Buying for Summer in NYC