Not very useful. Granted it was published in 1992 so there's a bit of incorrect information (stays actually were boned in cordage, reed, and other materials and were very comfortable).

If you want the most update information or at least somewhere to buy clothing from this time period, check out townsends.us. (Yes, the website ends in us. They sell lots of stuff related to the 18th century and reenactment.) They also have a YouTube channel (Townsends) that covers 18th century history (especially food). Two other YouTube channels to check for historical fashion: priorattire and CrowsEyeProductions.

I recommend those channels and websites because I find them informative and I like their videos. ( )

Very few patterns and generally for very basic, working class garments. Probably a pretty decent book for those who do living history. (Not my area of expertise.) ( )