5 Boho Cotton Sundresses for Summer 2025 - Under $40

As temperatures rise, there’s nothing more refreshing than slipping into a lightweight, breathable sundress. Whether you’re heading to a picnic, a beachside brunch, or just running errands, a sundress is a must-have summer staple. We’ve rounded up some of the best and most stylish options for Summer 2025 that are not just cute and affordable but also primarily cotton material.

Cotton a natural, eco-friendly fabric that helps keep you cool and comfortable while reducing exposure to synthetic materials that shed microplastics. Choosing cotton clothing means supporting sustainable fashion and avoiding the environmental and health concerns linked to polyester and other synthetic fibers.

Check out our picks for this summer!

1. Chouyatou Women's Striped Smocked Spaghetti Strap Sundress

• Why We Love It: This adorable striped sundress is perfect for casual summer days. The smocked bodice provides a flattering fit, while the flowy cotton fabric keeps you cool and comfortable.

• Features:

  • 100% cotton fabric

  • Adjustable spaghetti straps

  • Smocked design for a fitted look

  • Midi length for versatile styling

• Perfect For: Casual outings, summer vacations, and weekend brunches.

• Price: $32.50

• Where to Buy: Available on Amazon

2. Berydress Flattering Spaghetti Strap Cotton Sundress

• Why We Love It: If you’re looking for a dress that’s both chic and comfortable, this Berydress sundress is a great option. With its A-line silhouette and soft cotton fabric, it offers a flattering and breathable fit.

• Features:

  • Cotton and polyester blend fabric

  • Adjustable spaghetti straps

  • Flattering A-line shape

  • Knee-length for an effortlessly stylish look

• Perfect For: Date nights, summer parties, or an easy yet elegant daytime look.

• Price: $26.32

• Where to Buy: Available on Amazon

3. PRETTYGARDEN Smocked Spaghetti Strap Sundress

• Why We Love It: This elegant smocked sundress is flattering on all body types, with a stylish and breathable design perfect for warm weather.

• Features:

  • Lightweight 100% cotton fabric

  • Soft, breathable cotton material

  • Elegant flowy silhouette

• Perfect For: Special occasions, summer weddings, and evening outings.

• Price: $27.53

• Where to Buy: Available on Amazon

4. Lightning Sleeveless Cotton Sundress with Pockets

• Why We Love It: This casual yet stylish linen & cotton sundress includes pockets, making it a practical and comfortable choice for everyday wear.

• Features:

  • Cotton and linen blend for maximum breathability

  • Sleeveless design with a flattering fit

  • Pockets for added convenience

• Perfect For: Running errands, casual day outings, and lounging at home.

• Price: $15

• Where to Buy: Available on Amazon

5. CUPSHE Sleeveless V-Neck Ruching Smocked Cotton Dress

• Why We Love It: This dress combines a trendy v-neckline with ruching and smocking for an ultra-flattering fit. The breathable cotton fabric makes it an excellent choice for warm weather.

• Features:

  • Sleeveless with a stylish v-neck

  • Smocked waist for a comfortable fit

  • Soft, breathable cotton fabric

• Perfect For: Date nights, casual summer outings, and vacations.

• Price: $38.39

• Where to Buy: Available on Amazon

How to Style Your Cotton Sundress for Summer 2025:

A sundress is versatile and can be styled in multiple ways - we recommend:

• Casual Day Out: Pair your sundress with flat sandals, a straw hat, and a tote bag.

• Beach-Ready: Layer it over your swimsuit with flip-flops and oversized sunglasses.

• Chic & Elegant: Dress it up with wedges, gold jewelry, and a clutch for an evening out.