For a casual, everyday look, you can pair your plaid shorts with a simple solid-colored t-shirt or tank top. A white, navy, or black tee will always create a classic and effortless look. You can also add a denim jacket or cardigan for extra warmth on cooler days.
For a more polished look, you can opt for a button-down shirt or a polo shirt. A light blue or white button-down shirt will pair well with plaid shorts, especially if you tuck it in. A polo shirt can also be a great option, as it's more relaxed than a button-down shirt but still looks put-together.
If you're looking to make a statement, you can try pairing your plaid shorts with a printed or patterned shirt. A floral, paisley, or striped shirt can add some visual interest to your outfit. Just make sure the pattern of your shirt is not too similar to the plaid pattern of your shorts, as this can create a busy look.
No matter what kind of shirt you choose, make sure it fits well and is comfortable to wear. Plaid shorts are a great way to add some fun and personality to your summer wardrobe, so don't be afraid to experiment with different shirt options to find the perfect look for you.