First the positives;
It has very detailed instructions (including step by step photographs) for hand sewing which is a positive if you do want to hand sew, it has a lot of attractive photos. The patterns seem to match those in better referenced books and I know some people have made good looking garments. There seems to be research behind it even if it’s not really made explicit in the text itself.
Overall this book has turned out to be a disappointment. The rave reviews on so many historical blogs led me to expect something like the Tudor Tailor (which is a similar price but covers the 16th century) with in depth discussion of how clothes worked, different fabrics (historically and modern substitutes), how clothing varied between classes, and a lot of different patterns with mix & match options like changing sleeves, collars, decoration or accessories as Tudor Tailor covers both men and women I expected more in this book which focuses on just women’s clothing.
This book has 4 dresses (1740s, 1760s, 1780s & 1790s) with accessories, but minus shift or the crucial stays (I expected that meant they had put undergarments in a separate volume to treat them in depth but according to their blog the next book is due out soon about hair & beauty). The sewing instructions could do with some hints for those who want to sew it by machine (even something as simple as ‘this bit must be done by hand it won’t work on a sewing machine’ would be a start). There’s little suggestion in the text itself for variation (there aren’t even images to suggest other ways you could decorate a gown) to avoid a cookie cutter effect. It needs better referencing (occasionally there’s something like ‘the decoration on this dress is based on a 1776 portrait of Mary Smith by Joseph Bloggs’ but it needs more).
The biggest problem is scale, there are patterns drawn on a grid which is indicated as a 1 inch grid but the grid on the paper is not a simple ratio to an inch in real life and every pattern is on a different scale. If you want to enlarge using any sort of measuring device or using a photocopier you’re going to need a calculator and/or a lot of wasted attempts. Instead of planning ahead that this is the paper size therefore I need to scale my patterns so they can fit on this size page at a useable scale they have just drawn patterns and then accepted whatever the ratio happens to be once it’s squeezed onto one full page (e.g. on p. 138 the 1780s ‘Italian gown’ is at 6:25 scale based on measuring a square, good luck getting a photocopier to understand that). Most of the scales are close to a simple ratio and you could just simplify it but every error in the original is magnified when you size it up. Taking the above ratio (6:25) if you simplified the ratio to 5:25 (or 1:5) you are shrinking every measurement by 1/6 meaning a dress will be 1/6 smaller than expected, so, for example if the gown should have a 28 inch waist (an average size 12) it would end up 4 ½ inches too small. I also can’t find where it specifies what measurements the patterns are drafted to fit meaning that grading up or down a size is a step behind where it needs to be.
They do suggest that draping patterns is preferable to flat patterning but as there's no instructions on how to drape a pattern the drafted patterns should be useable.