The three most important natural fibers in tailoring are wool, cashmere, and mohair. Each comes from a different animal, has different physical properties, and is best suited to different garments and occasions. Understanding them helps you make better choices at every stage of the tailoring process — from fabric selection to care and longevity.
Wool: The Foundation
Wool is the baseline of tailoring. It comes from sheep — primarily Merino sheep, bred for the fineness of their fleece — and has been the principal suiting fiber for centuries. Its dominance is not traditional inertia; it is because wool performs better than any other fiber for the specific demands of tailored clothing.
Why wool works for suiting:
- Resilience: Wool fiber is crimped at a microscopic level, which gives it memory. A wool suit pressed in the morning recovers from sitting and moving through the day. Synthetic fabrics do not have this property.
- Breathability: Wool fibers regulate temperature. The structure wicks moisture away from the body and allows air circulation in a way that synthetic suits do not.
- Pressability: Tailors shape wool with steam and pressure — the technique of molding a canvas to the chest, setting a crease in a trouser, or shaping a sleeve head all depend on wool's responsiveness to moisture and heat.
- Range: Wool comes in every weight from ultra-lightweight (6–7 oz./yard) to heavy overcoating (20+ oz./yard), in smooth or textured surfaces, in fine or durable fiber grades.
The wool Vestium NY sources — Holland & Sherry Super 120s, CARNET's Italian cloths, Fratelli Tallia Di Delfino's fine wools — represents the top of what this fiber produces. Commercial suiting wool exists at a fraction of the cost and a fraction of the quality.
Cashmere: The Luxury Tier
Cashmere comes from the undercoat of the Cashmere (Kashmir) goat, primarily from Mongolia and China, with smaller quantities from other regions. The fiber is significantly finer than most wool — typically 14–18 microns in diameter, compared to 15–25 microns for fine Merino wool.
What cashmere does:
- Softness: The fineness of the fiber produces a tactile quality that is immediately recognizable. Pure cashmere against skin is softer than any wool.
- Warmth-to-weight: Cashmere is warmer per unit of weight than wool. A lightweight cashmere coat provides more warmth than a much heavier wool coat.
The trade-offs:
- Delicacy: Cashmere pills more readily than wool and is more susceptible to moths and mechanical damage. Pure cashmere suiting must be cared for carefully.
- Less resilience: Cashmere doesn't recover from wear as readily as wool. It lacks the crimping structure that gives wool its memory.
When to choose cashmere:
Cashmere is at its best as a sport coat or overcoat fabric — worn less frequently than a daily suit, cared for between uses, and chosen for occasions where its tactile luxury is part of the point. Pure cashmere suits are magnificent but impractical for daily wear. Cashmere-wool blends (our recommendation for most clients wanting cashmere in a suit) combine cashmere's softness with wool's durability.
Mohair: The Lustrous Exception
Mohair comes from the Angora goat (not the Angora rabbit, which produces Angora fiber — a persistent source of confusion). The fiber is long, smooth, and lustrous — it has a natural sheen that no other suiting fiber matches.
What mohair does:
- Luster: Mohair fabric catches light in a specific way — a controlled shine that is distinct from the saturation of silk or the flatness of standard wool. A mohair suit in a fine tropical weight has a presence in a lit room.
- Resilience: Mohair fiber is highly resilient. It resists creasing extremely well and recovers quickly from compression — making it one of the best travel fabrics available.
- Cool and light: Mohair tropical suiting is among the most heat-resistant suiting fabrics available. The fiber's smooth surface doesn't trap heat, and a lightweight mohair blend is genuinely comfortable in summer.
When to choose mohair:
Warm-weather formal suits and tuxedos. A mohair-wool blend in a summer weight produces a suit that looks formal and polished while performing in heat. The luster of mohair also makes it particularly well-suited to evening wear — mohair blend dinner jacket fabrics have a natural formal sheen.
At Vestium NY
We work with all three fibers across our range. For the daily business suit, the backbone is fine Merino wool from Holland & Sherry or CARNET. For a winter sport coat or luxury overcoat, cashmere-wool blends from Fratelli Tallia Di Delfino or Holland & Sherry. For summer formal and tropical suits, mohair-wool blends where that specific luster and heat performance are priorities.
The right fiber depends on the garment, the season, and how it will be worn.
Frequently Asked Questions
What is the difference between wool and cashmere in a suit?
Wool is more durable and resilient; cashmere is softer and warmer per unit of weight. For daily wear, wool is the practical choice. For less frequent wear where tactile luxury is a priority, cashmere or cashmere-wool blends are appropriate.
Does Vestium NY use mohair in tuxedo fabric?
Yes — mohair-wool blends are appropriate for certain summer formal and tropical weight suiting. The natural luster of mohair makes it well-suited to evening wear in warm climates.
Is cashmere appropriate for a suit?
Pure cashmere suits are beautiful but fragile. For a daily business suit, we recommend cashmere-wool blends rather than pure cashmere. For special occasion pieces worn infrequently and cared for properly, pure cashmere is appropriate.
What animal does mohair come from?
The Angora goat. Mohair is the fiber from the Angora goat's fleece — not to be confused with Angora fiber, which comes from the Angora rabbit.
Which fabric is warmest — wool, cashmere, or mohair?
By warmth-to-weight ratio, cashmere is the warmest, followed by wool. Mohair, despite being an animal fiber, is prized for its ability to stay cool — it is a warm-weather fiber in many applications.
Work with Vestium NY. Vestium NY works with Merino wool, cashmere, mohair, and blended fibers from Holland & Sherry, CARNET, and Fratelli Tallia Di Delfino.