Choshi · Local

Everyday comfort, redefined

Core Grid Lab Stream was founded in Choshi, Chiba, by a designer who was tired of choosing between pretty lingerie and clothes she could actually wear all day.

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What stands out

Why people choose Core Grid Lab Stream

Practical details that matter when you wear basic women's underwear from Choshi — fit, fabric and how each piece holds up day to day.

Seamless finish

Laser-bonded edges leave no lines under workwear.

Breathable cotton

Soft cotton blends that stay fresh through humid days.

True-to-size

Graded carefully so sizing is honest and predictable.

Keeps shape

High-recovery yarns bounce back — no sagging.

Our story

How Core Grid Lab Stream started in Choshi

Core Grid Lab Stream was founded in Choshi, Chiba, by a designer who was tired of choosing between pretty lingerie and clothes she could actually wear all day. In a coastal loft above a fabric supplier, she sketched basic underwear women could forget they were wearing — cotton first, seams second, ego nowhere.

The first drop of comfortable lingerie and an everyday bra sold from a folding table at a weekend market. Customers came back for seamless underwear that disappeared under dresses and cotton lingerie that survived humid summers. That market stall became a mail-order drawer brand shipping womens basics nationwide.

Now Core Grid Lab Stream is a focused line of comfy underwear: seamless underwear, cotton lingerie, and everyday bra styles graded for real Japanese sizing. We still design in Choshi — short ranges, careful fabrics, and packaging as quiet as the pieces themselves.

Our promise

What Core Grid Lab Stream stands for

Invisible under knits

Bonded edges disappear under office shirts and fine sweaters.

Cotton that recovers

Blends chosen for humidity — soft at 8am, still shaped at 8pm.

Choshi quiet pack

Coastal warehouse, plain cartons, English replies within a day.

Customers

Notes from people who wear Core Grid Lab Stream

“Most comfortable everyday set I've owned — invisible under dresses.”

— Nanami O., Chiba

“Bought three T-shirt bras. Haven't reached for anything else.”

— Fumika I., Saitama

“Seamless briefs stay put. Soft and true to size.”

— Chika W., Tokyo

At a glance

Core Grid Lab Stream in numbers

A few signals from how we build and ship basic women's underwear out of Choshi.

6core SKUs
XS–3Lsize span
¥5k+free ship
OEKOTEX cotton

Core Grid Lab Stream in Choshi stocks basic women's underwear including basic underwear women, comfortable lingerie, everyday bra, seamless underwear. Regular favourites also include cotton lingerie, womens basics, comfy underwear. We restock basic underwear women, comfortable lingerie, everyday bra, seamless underwear and keep cotton lingerie, womens basics, comfy underwear ready for nationwide Japan delivery.

Order from Core Grid Lab Stream

Plain packaging, clear sizing, and delivery across Local from Choshi.

Shop everyday basics