The printed cardboard at the end of a fabric bolt is the only documentation your fabric will ever have. Once it is cut and folded into a bag, that information is gone unless you copied it. Learning to read it properly takes about five minutes and saves a great deal of guessing later.
Fibre content and what generic names legally mean
The line reading something like 97 percent cotton, 3 percent elastane is not marketing copy. In the United States it exists because of a federal labelling requirement. The FTC Textile Fiber Rule at 16 CFR Part 303 requires that certain textiles sold in the US carry labels disclosing the generic names and percentages by weight of the constituent fibers in the product, the manufacturer or marketer name, and the country where the product was processed or manufactured.
Two words in that are worth pausing on. Generic names means standardised fibre category names rather than trade names, so viscose is a generic name and a branded rayon is not. Percentages by weight means the numbers describe mass, not volume or surface appearance. A fabric that is 20 percent wool by weight can look and feel considerably more woolly than that if the wool sits on the face.
The FTC’s detailed trade guidance, Threading Your Way Through the Labeling Requirements Under the Textile and Wool Acts, sets out the fine print behind those percentages: which components are exempt from being counted, how sectional disclosure works when different parts of a product differ, tolerances for fiber content, rules on premium cotton names such as Pima and Egyptian, and how fibre trademarks may be used alongside generic names. If a bolt end says something you find surprising, that document usually explains why it is worded the way it is.
Width, and why it changes your yardage
Width is stated in inches or centimetres and is the second most useful number on the bolt. Common apparel widths cluster around 44 to 45 inches and 58 to 60 inches, with quilting cotton usually at 42 to 44 inches of usable width once selvages are trimmed.
Width changes yardage requirements dramatically, and not linearly, because pattern pieces have fixed dimensions that either fit side by side across the width or do not. A skirt panel 30 inches wide fits twice across 60 inch fabric and only once across 44 inch fabric, so the same garment can need nearly double the length. Pattern envelopes list yardage separately for each width for exactly this reason. Check whether the stated width is full width or usable width, since selvages on some fabrics carry pin holes or printed information and are not sewable.
Care, origin and the rest
Bolt ends usually carry care symbols or wording. Piece goods sold by the yard sit in a different regulatory position from finished garments, but the underlying framework is the same one described in the FTC guidance on complying with the Care Labeling Rule, which requires manufacturers and importers to attach care instructions covering washing or drycleaning, bleaching, drying and ironing. Treat the bolt end care information as the manufacturer’s statement about what the fabric tolerates, and use it to decide how you will prewash.
Country of origin tells you where the product was processed or manufactured. Some bolts also carry a lot or dye number. That one matters if you may need more of the same fabric later, because dye lots vary visibly and a later purchase from a different lot will not match across a seam.
Price per yard versus price per usable area
Comparing prices per yard across different widths is meaningless. Convert to price per square yard by dividing the per yard price by the width in yards. A fabric at 18 dollars per yard at 60 inches wide is 10.80 dollars per square yard. The same fabric at 14 dollars per yard at 44 inches wide is 11.45 dollars per square yard, so the apparently cheaper option is more expensive per usable area, before you account for the extra waste that narrow widths cause in layout.
Record it before it is lost
Whatever system you use, capture the bolt end at the point of purchase. A photograph of the label with the cut fabric in the frame takes two seconds. Better still, write on a small card and pin it to the folded piece: fibre content, width, length purchased, care, price, dye lot and date. When you pull that fabric out of storage in two years, you will know whether it can take a hot iron, whether it has been prewashed, and how much of it you have. Nothing else in the stash management picture pays back as reliably.
