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Worsted Wool Suiting Guide

It is probably the most popular fabric for men’s suits in the world, and although many fabrics are technically worsteds, the differences in quality couldn’t be greater. The goal of the Guide to Worsted Wool is to help you understand everything about worsted wool so you can pick exactly the fabric that is right for your need

Before the fabric can be woven, the yarn is produced from raw wool;

1.With the help of rotating metal combs, all short staple wool fibers are discarded. The result is the so-called top, a semi-finished strip of long staple wool fibers

2.The top is further reduced in diameter

3.At this stage, it can be dyed as a whole or vigoureux printed

4.Now the wool can be spun into yarn by pulling and twisting the wool. By adjusting the pull, one can get lighter or heavier yarns whereas varying the twist will impact the look and feel as well as the strength of the yarn. Tight twisting provides a crisper feel, whereas loose twisting makes for a softer, weaker yarn

5.Excellent worsted yarns are made of tight crimping wool. Wool fibers are tightly crimped when the surface has many open scales, resulting in a uniform and durable yarn

6.The yarn is then woven into a fabric

Finally, the cloth is finished

Why Is It Called Worsted?

The name’s origin goes back to the 12th century, when the English city of Worstead in Norfolk, along with a few other cities in the area, became a manufacturing center of cloth weaving.

Is Lighter Worsted Better Than Heavy? No, Not Necessarily

Analog to the megapixel race for cameras, it seems like the market constantly demands lighter and softer fabrics. While a soft fabric feels pleasant on one’s skin, a heavy overcoat made of Donegal Tweed is often preferable to a fine, lightweight cashmere overcoat in terms of look and function.

It’s important to keep in mind that a lighter fabric with a higher SUPER Number is not a hallmark of a better fabric, it just indicates that the fibers used were thinner in diameter. The SUPER Number does not provide any information about the particular weave, whether 2-ply, 3-ply or 4-ply yarns were used for warp and weft, and it also does not tell you how heavy the fabric is.

Nevertheless, fabrics today are usually lighter across the board than they were 30 or 40 years ago. Most worsteds today fall between a range of 180 – 300 grams per meter (6 – 10 oz) though for practical purposes 210 grams / 7 oz should be as low as you should go unless you are willing to compromise some of the characteristic robustness of a worsted fabric.


Lighter Fabric ≠ Cool Fabric

Most men today believe that a lighter fabric wears cooler and thus is more comfortable than a heavier fabric, but such generalizations are simply wrong. A relatively heavy, open weave fresco fabric feels much cooler and comfortable on a hot day than a tightly woven, lightweight super 150 fabric. Furthermore, the interlining and canvas of a jacket has a tremendous impact but that’s a subject for a different article.


SUPER 100’s, 120’s, 150’s – The Numbers Explained

When you buy a suit or wool fabric, the chances are that you will see a SUPER Number advertised, and the higher the number, the more you are asked to pay. Unfortunately, this number does not help you to objectively compare fabric qualities across different manufacturers. To understand the meaning of the numbers, it is essential to understand the history behind it.


The Origins Of The SUPER Number

Up until the 18th-century British wool merchants would describe products with subjective terms such as Low, Medium, Fine, Super… Obviously, this was not objective enough and so wool merchants in the city of Bradford, England rated the quality of wool by estimating how many hanks could be spun by a skilled spinner from a pound of combed wool.  A hank was defined as a single strand yarn of 560 yards length.

This process became known as the English Worsted Yarn Count System or Bradford System.

The finer the average diameter of a single wool fiber, the more hanks could be spun. Normal wool yielded 44 hanks, which was classified as 44’s wool. Finer wool produced 64’s and the finest wool back then reached 80’s. Thus, the super number was born, though even back then the exact count depended on the evaluator and so it was never 100% accurate.

The SUPER System Gets Refined & Objective

On December 21, 1968, the U.S. Department of Agriculture issued the United States Standards for Grade Wool, which assigned ranges of average fiber diameter (AFD) and maximum standard deviation to each Bradford count. According to standards, Grade 80’s Wool had to have an average fiber diameter of 17.70 to 19.14 microns, inclusive, and a standard deviation in fiber diameter of 4.09 microns or less. Other commonly used numbers were  80s, 70s, 64s, 62s, 60s, 58s, 56s, 54s, 50s, 48s, 46s, 44s, 40s, and 36.

SUPER Numbers Today

Through the breeding of sheep, it is possible today to get wool fibers of 14 microns and less, which is not even on the 1968 scale.  Therefore, many cloth weavers and suit makers have created their own SUPER number system. As a consequence, a SUPER 200’s fabric from one company can be considerably coarser or finer than from another.

Fortunately, weavers of quality wool cloth abide by the Fabric Labelling Code of Practice by the International Wool Textile Organization (IWTO). This means you can compare SUPER numbers from Vitale Barberis Canonico with Holland & Sherry or Loro Piana, for instance.

Here are the exact definitions but bear in mind, that higher numbers don’t necessarily mean better fabric. It just indicates the fineness of the yarn diameter, but alone doesn’t indicate the quality. Naturally, the finer yarns are rarer than coarser yarns, and so quality weavers like Vitale Barberis Canonico ensure that they utilize only the best weaving and finishing techniques for their most precious fibers.

REVENGE – Double Twist In Navy Blue

The word Super (as in SUPER 100’s, for example) can only be used to describe fabrics made from pure new wool, and the “S” value is determined by, and must comply with the Maximum Fibre Diameter values, in the table below (micron and µ are the same thing):

SUPER “S” descriptions may also be used for fabrics made from wool blends with mohair, cashmere, alpaca and silk. Sadly, the super number can also be used if elasthane was added for stretch or if up to 5% non-wool yarn was added for decorative effects.

Super 100’s ≠ 100’s

Other blends than the ones mentioned above may not use the word SUPER “S” descriptions but it can be labelled as “S”. So, while a wool-cashmere blend can be called SUPER 100’s if the fiber is 18.75 µ in diameter or less, a wool-nylon blended fabric with the same fiber tickness could only be labelled as 100’s without the SUPER.

This is the case as long as the wool content is at least 45%.



Famous Worsted Patterns and Weaves

Since “worsted” only refers to the yarn that was used during the weaving process, a worsted can come in all kinds of weaves: plain weave, twill, barathea… The same is true for patterns. However, the most popular worsteds come in solid colors, stripes, Prince of Wales checks, sharkskin, needle head, and hopsack. All of these will be covered in a separate guide, so stay tuned!

ICONS By Vitale Barberis Canonico

Vitale Barberis Canonico produces a range of superb all-wool worsteds, and I would like to highlight 3 of my favorite picks from their ICONS Collection: Perennial, Revenge, and Greenhills

SUPER 110’s PERENNIAL double stripe

PERENNIAL – The Perfect Everyday Fabric For Business Suits

The word “perennial” refers to feeling at ease in any season and in any situation and therefore, it is the perfect name for this range of fabrics. Made of SUPER 110’s wool in 260 grams / approx. 9 oz in classic patterns, it was designed to be worn during three seasons. Paired with an unbeatable price, it’s not surprising that the PERENNIAL is VBC’s best selling range.



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