Happy birthday, Seulgi: how to get the Red Velvet star’s nonchalant cool-girl style

Off-duty dressing rarely hits this hard without looking like you tried. It’s about letting clothes breathe, leaning into shape and rhythm instead of forcing a pose. Seulgi gets it—moving between rehearsals, airports and stages, she’s made this kind of effortless logic her signature. Red Velvet’s firecracker, who celebrates her birthday on February 10, can steal a spotlight, but offstage she’s all loose knits, oversized tops and layers that just fall right.

Her aesthetic blends minimalism with subtle experimentation, favouring oversized tops, relaxed tailoring and quiet layering. Fans and fashion observers alike respond to her wardrobe for its relatability: a casual chic aesthetic that makes Seulgi seem even more approachable. Her style is built around familiar pieces worn with consistency and comes from understanding how volume, texture and small accessories can shift the mood of simple outfits. For anyone looking to replicate Seulgi’s style, the focus should be on how garments interact rather than what labels they carry.

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Wear oversized tops

Roomy pullovers and tees are Seulgi’s signature move for effortless style (Photo: hi_sseulgi/Instagram)

Seulgi proves oversized tops can feel curated rather than sloppy (Photo: hi_sseulgi/Instagram)

Seulgi’s casual wardrobe frequently incorporates tops that lean into deliberate oversize, shaping her off‑duty look without relying on tight tailoring or fitted pieces. Photographs from her street style and social media appearances show her in roomy button‑downs or relaxed T‑shirts that hang away from the body, creating a softer, less defined outline that still feels intentional. An oversized cotton shirt paired with simple trousers or loose sweater over denim illustrates how larger shapes can read as thought‑through rather than sloppy. These choices are not about hiding form but about proportion: dropped shoulders and extended hems help the garment hang naturally, giving the outfit a considered ease.

Choose baggy or barrel jeans and trousers

Relaxed denim is Seulgi’s go-to for grounding oversized silhouettes (Photo: hi_sseulgi/Instagram)

Pants play a significant role in how Seulgi structures casual looks, often favouring relaxed fits that sit comfortably rather than cling. Photos of her streetwear and airport outfits shared online show her wearing baggy jeans with crop tops or oversized shirts, creating silhouettes that feel grounded and proportioned rather than styled for effect. In several casual outfit compilations, Seulgi pairs baggy denim with simple tops and caps, demonstrating that looser cuts can read as intentional everyday wear rather than decorative pieces. These choices add visual weight to the lower half of an outfit, helping balance oversized tops while keeping the overall look coherent. The emphasis in her off‑duty ensembles is continuity and comfort, with repeated use of similar denim silhouettes contributing to an identifiable personal style logic.

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Play with skirts

A skirt-over-pants combo becomes a statement in Seulgi’s wardrobe (Photo: hi_sseulgi/Instagram)

Seulgi shows how skirts can add movement and contrast to relaxed, oversized outfits (Photo: hi_sseulgi/Instagram)

Skirts aren’t just for polished outfits in Seulgi’s wardrobe—they’re a tool for contrast and movement. She pairs them with oversized tops or relaxed outerwear to keep proportions interesting, letting a flowing or pleated silhouette break up more structured pieces. Fabrics range from soft cottons to subtle textures, adding depth without calling attention. When she goes hyper-feminine, skirts become the statement: a high waist or a mini length can turn an otherwise casual outfit into something striking. The key is balance—Seulgi rarely over-accessorises, letting the cut, texture and movement of the skirt do the work. For anyone looking to incorporate this into their own wardrobe, a skirt in a neutral palette or unexpected shape can shift the mood of familiar pieces while staying grounded in her effortless logic.

Pile on some texture

Texture is the secret: Seulgi shows how fabrics can do the styling (Photo: hi_sseulgi/Instagram)

Seulgi layers cotton, denim and knits to give muted outfits dimension (Photo: hi_sseulgi/Instagram)

Seulgi’s outfits often combine fabrics of differing weights and finishes to create dimension without relying on bright colour or heavy pattern. In street and airport looks, she has paired loose tops with structured denim or trousers, letting the contrast in fabric behaviour shape the silhouette subtly. Layering a voluminous, feathered coat over a sheer top or playing with different shades and types of denim helps prevent relaxed fits from seeming flat or shapeless, giving outfits a sense of considered structure even when they feel effortless. These subtle contrasts between cotton, denim and more substantial outer layers add visual interest without relying on overt details or accessories.

Accessorise with a hat

A cap or beanie adds shape and focus, just as Seulgi does with ease (Photo: hi_sseulgi/Instagram)

Seulgi’s outfits often include purposeful headwear that feels functional and shapes the overall silhouette in subtle ways. In airport looks that have drawn attention online, she has worn baseball caps paired with casual trousers and outerwear, using the cap to anchor the outfit and influence how the rest of the pieces read together. Fans and fashion observers have shared many images of Seulgi in caps and buckets or winter hats.

Surprise them occasionally

Seulgi shifts to bold, feminine pieces for moments of deliberate impact (Photo: hi_sseulgi/Instagram)

A striking dress or fitted top lets Seulgi break her usual relaxed rhythm (Photo: hi_sseulgi/Instagram)

Seulgi’s everyday wardrobe is anchored in relaxed, functional pieces, but her overall fashion repertoire includes moments that feel intentionally bold or more overtly feminine. Her public style shows a willingness to mix lingerie‑inspired tops, fitted dresses and pieces that reveal skin or contours within an otherwise minimal palette. These choices register as deliberate shifts, create statements that veer from her usual comfy aesthetic. For anyone looking to borrow Seulgi's style, a singular, eye‑catching feminine piece—whether a fitted top, a short hemline or a defined waist—can operate as a purposeful contrast to more relaxed garments and shift the mood of the outfit.

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