Part of the ‘Antique Fabrics‘ series, this fabric isn’t necessarily extinct, but it was more popular in the past than the present.
A rough twill or plain-weave fabric with linen warp (sometimes cotton) and wool weft. Warm, strong and cheap – at the time. Still created in limited quantities today for use by historical re-enactors. Given it’s strength and warmth, it’s suitable for working/middle-class gear, but it would be too “common” for the upper classes.
For a good-enough substitute, consider a hard-wearing twill, serge or broadcloth made of wool or a wool/cotton blend. Linen is pricey, but if you can find a linen-wool blend with a rough-enough hand, then go for it. Also keep an eye on your color choices – no hot pink unless it’s after 1860!