How to Style Sunglasses: The Complete Guide to Fashion’s Favourite Accessory

Sunglasses are fashion’s most low-effort, high-impact accessory. A pair of well-chosen sunglasses completes a summer outfit instantly — they add a deliberate finishing detail, project confidence, and work across every outfit type from the most casual beach look to the most considered occasion outfit. Unlike most accessories, which require matching to a specific outfit register, sunglasses work as a universal finishing layer that makes virtually any look appear more intentional.

The most important sunglasses consideration is frame shape relative to face shape — choosing a frame that creates a flattering visual balance with your face’s natural proportions. The second consideration is the frame’s character (classic, sporty, oversized, architectural) relative to the outfit’s character. Understanding both of these allows you to build a sunglasses wardrobe that genuinely works across everything you wear.

Sunglasses by Face Shape

Oval Face

An oval face — balanced proportions, gently curved sides, slightly wider cheekbones than forehead and jaw — suits virtually every frame shape. The most recommended classic options: square or rectangular frames that add angular definition; oversized frames that balance the face’s gentle curves; aviators that echo the oval’s elongated proportion. The oval face’s versatility means the primary consideration is the frame’s fashion character rather than strict face-shape rules.

Round Face

A round face — equally wide and long, with full cheeks and a rounded jawline — is most flattered by frames that add length and angular definition. Rectangular, square, and geometric frames work best; they create visual contrast with the face’s curves. Avoid very round or very small frames that echo the face’s circular impression and reduce the appearance of definition. A rectangular frame with a bold bridge and a slight upswept corner is the single most flattering configuration for most round faces.

Square or Angular Face

A square face — strong, angular jaw, broad forehead, little difference in width between forehead and jaw — is most flattered by frames that soften the angular impression. Round, oval, or cat-eye frames that curve where the face angles create visual contrast and balance. Avoid strongly square or rectangular frames that echo the face’s angularity. Oversized round frames are particularly effective at softening a strong jawline.

Heart-Shaped Face

A heart-shaped face — wide forehead, prominent cheekbones, narrow pointed chin — is most flattered by frames that add visual width at the lower half of the face. A frame that is wider at the bottom than the top, or cat-eye frames that draw the eye upward and outward at the cheekbone, work particularly well. Aviators with their slightly wider lower lens are also a strong choice for heart-shaped faces.

Classic Sunglasses Frame Styles

Aviator

The aviator — a teardrop-shaped lens with a thin metal frame — is one of fashion’s most enduringly popular sunglasses silhouettes. Originally designed for pilots, the aviator has become a classic that works across face shapes and outfit types. Its metal frame and slightly retro character make it a natural partner for casual and relaxed outfits: denim shorts and a simple top; a floral midi and flat sandals; a linen co-ord for summer. According to the Business of Fashion, the aviator frame consistently appears among the top-selling sunglasses silhouettes across all price points and remains one of the most widely worn and most photographed styles globally.

Oversized

Oversized frames — covering a large portion of the face — provide the maximum sun protection and the most dramatic fashion statement simultaneously. The oversized frame’s glamour suits occasion dressing, resort wear, and any outfit where a deliberate fashion statement is appropriate. With a simple outfit (a linen dress, tailored shorts and a top), oversized sunglasses add sufficient visual interest to complete the look without additional accessories.

Cat-Eye

The cat-eye frame — upswept at the outer corners, typically in a plastic or thick-rimmed construction — creates a distinctly vintage-inspired impression that reads as deliberately fashion-forward. It suits oval and heart-shaped faces particularly well. The cat-eye pairs naturally with anything retro-inspired (a floral midi, a wrap dress) but also creates a strong contrast with very contemporary minimalist outfits where its retro character reads as an intentional styling detail.

Square and Rectangular

Square or rectangular frames — typically in a tortoiseshell, black, or coloured acetate — project a deliberate, architectural fashion intelligence. They are the strongest choice for elongating a round face and for projecting a more editorial, directional aesthetic. A square frame in tortoiseshell or black pairs naturally with almost any outfit and is the most broadly versatile classic frame option.

Matching Sunglasses to Your Outfit

• Casual summer (denim shorts, simple top) — aviator, round, or wraparound sport frame
• Smart-casual (midi dress, wide-leg trousers, blazer) — cat-eye, rectangular, or classic square frame
• Beach and resort — oversized frame with maximum lens coverage
• Autumn/transitional (coat, knit, boots) — tortoiseshell rectangular or bold square frames
• Monochrome outfit — a matching or tonal frame; or a deliberately contrasting coloured frame as the outfit’s single accent

Frequently Asked Questions

Do sunglasses need to match your outfit?

No — sunglasses do not need to match a specific outfit colour or style. What they should do is complement the outfit’s overall register. A very casual outfit with very formal sunglasses creates a mismatch; a very casual outfit with a classic aviator or simple square frame creates a natural, cohesive finishing detail. The most versatile sunglasses investment is a classic frame (aviator, rectangular, or classic square) in a neutral (black, tortoiseshell, gold metal) that reads as a natural companion to the widest range of outfits.

How many pairs of sunglasses should you own?

Two to three frames in different shapes or characters covers most needs. A classic everyday pair in a neutral frame and a bolder, more statement-making pair for occasions and resort wear is the minimum useful combination. A third pair in a distinctly different shape — an oversized frame if your everyday is rectangular, or a cat-eye if your everyday is round — adds the versatility to suit different outfit registers and face-framing needs.