New season
Dressed quietly.
Worn often.
A small collection of everyday essentials made from natural fibres. Each piece is chosen for how it feels against the skin, how it moves with the body, and how naturally it fits into daily life.
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Selected Natural Fibres
Each one has a character of its own.
Cashmere
Soft, light, and quietly warm. Care varies by garment — see each product's care label.
Golden Cashmere
Undyed cashmere in its natural golden tone — soft, lightweight, and worn close to the skin.
Cloud Cotton
A fluffy cotton-blend fleece knitted in Wakayama — thick but light, with a cloud-like handfeel.
Alpaca
Soft, airy, and warm for its weight, with a gentle natural character.
Washable Silk
Smooth, fluid, and refined — wash care subject to each product's care label.
Long Staple Cotton
Cotton spun from longer staple fibres for a smoother, more even yarn and a softer surface.
Material, personally chosen.
MATERICA is material picked by Erica.
Born from years of touching fabrics, wearing too many clothes, and learning what makes a garment feel right, MATERICA is Mercer St.'s own line of essentials. Each piece begins with material, then fit, comfort, and the quiet feeling of wanting to wear it again.
Knowledge on material, construction, and care.
All articles
Why Do T-Shirts Twist After Washing?
A side seam that shifts after washing offers a closer look at the yarn, knitted structure and making of an everyday T...
What Makes a Simple Garment Worth More?
Two T-shirts, same silhouette, both 100% cotton. One costs ¥1,500 and one costs ¥20,000. This note explains where the...
Haramaki: The Japanese Belly Warmer, Material Blends, and Quiet Craftsmanship
The haramaki is a Japanese abdominal warmer with a specific function and a surprisingly considered material story. Th...