Nothing says chic summer casual like a pair of breezy linen pants. Sadly, linen is usually pretty expensive, but thanks to Target we can stroll to the local ice cream parlor in style with Merona Linen Pull On Pants for only $19.99. The drawstring waist is a very casual touch, but makes them a comfy choice for summer days. They come in a cropped version if that's your style. (I want to try pegging the crops for a harem pant look). You can also buy plus sizes.
However, they aren't limited to the casual realm. If you can find a pair in black (which I've seen in stores but not online), you can iron a nice crease down the front and wear them to work paired with a structured summer blouse. Or try them with a shimmery evening cami and sky high heels for summer nights on the town.
Since they come in S, M, L style sizing, I recommend buying the size down if you are in between sizes because these get baggy fast (I bought two pairs last year and regret not getting the smaller size). This does not apply to the blue ones pretending to be the same pants. They are 100% cotton rather than linen so you can probably buy up and shrink them.