by couch » Tue Aug 19, 2008 6:06 pm
While agreeing with Sator that, in general, a well-finished, stored, and cared-for worsted of half a century or more's age should be resilient enough to work under the iron and tailor well (indeed garments of a century of more are still in regular use), it is not uncommon for woolen cloth to become stiff and brittle with age.
Wool fibers are mostly protein and subject to chemical deterioration which is more pronounced under exposure to heat. The fibers as finished yarns also retain some degree of natural lanolins (oils) and some moisture, both essential to maintaining the physical properties of the cloth. To some extent the moisture can be re-equilibrated by treatment (think of how steaming and brushing can reverse the shine on a wool twill as the fibers reabsorb moisture and revert to their natural "kink" from the flattened state they had acquired). But wool with too much lanolin stripped during finishing or due to cleaning solvents will loose resilience more quickly, and be more vulnerable to oxidative reactions, crosslinking, etc.as more protein molecules are directly exposed to atmospheric conditions. Mildew and other fungal activity can also cause the cloth to become embrittled without much surface warning; as, I suppose, could saltwater immersion. I've handled WWII-vintage woolen sailor's jumpers that cracked in two when I tried to fold them, and others that were as supple as if newly made.
In shopping for tribal rugs, one looks out carefully for "dead" wool--that is, yarn spun from the wool of dead or slaughtered animals rather than that sheared from healthy ones. Because the dead hairs have been less recently replenished, and likely to have less lanolin for various reasons (including possible disinfecting), this wool is duller, has less sheen, and is much more brittle. The expected life of the pile is much shorter than top-grade wool. One would be unlikely to find such wool in high-quality menswear cloths, but I mention the phenomenon to illustrate that, alas, while good wool is very durable, it's not forever. So do have a competent and trustworthy tailor evaluate the cloth (one who will not be discouraged, as Sator suggests, by its substance) before investing in having it made up--preferably one familiar with vintage cloths. Attic storage in a warm climate may have "artificially aged" it beyond use, but not all the cloths so stored may have responded identically.
I don't know whether a new sponging is enough to refresh some cloths or not--perhaps our tailors can opine.