Often in a Regency book, we find a situation where the woman requires a new day dress, gown, riding habit, etc. I was reading a book of late where the modiste finished several gowns in two days, but was that possible, especially as the gowns were all hand sewn?
In reality, the answer is not as clear cut as one might imagine. It depends on so many variables; therefore, no exact answer can be had. Is the modiste in London or a provincial town? How important is the client? For example, a duchess would command more service than somebody unknown. How many other clients is the modiste dealing with at the same time? When does the London Season begin? Everyone would be looking for new gowns with the onset of the Season, so modistes would be overrun with business. In A Touch of Scandal, I have Lady Eleanor Fowler and Miss Velvet Aldridge arrive in London several weeks in advance of the Season so they may have new gowns made. In other books where urgency is required, I have the heroine purchasing what she can, but that is usually from a female proprietress in a village shop.
Small adjustments after a final fitting likely took less than an hour, depending on the amount of work that needed to be done. All measurements would have been made before starting the gown, so there would be only tiny adjustments. A London modiste would have MANY seamstresses working for her. [A slightly out-of-period side note. Around the middle of the 19th century, the average Parisian modiste employed 20 seamstresses. By 1870, when his business was really taking off, Charles Worth employed 1200, turning out thousands of extremely elaborate dresses a year.] In an emergency, they could put together a simple gown for an important client in less than a day from scratch. And they would would late into the night, or through the night, if need be, to please a regular client or a client of whom they were very fond.
The amount of work a dressmaker has and the number of seamstresses employed determine how long it took to make a garment. Of course, the trimming and such also matters. A court dress could well take five days if the seamstresses worked on nothing else. If one needed a garment made expeditiously, one could pay extra, and it could usually be done.
A London dress maker could usually make one faster than a village seamstress, though even a village seamstress could finish a simple dress in three days if she had no other work.
There were no printed patterns so the lady and the dressmaker would have to confer on the dress’s style and the choice of fabric. If the lady had never been to the store before, she would be measured and a unfinished muslin or linen mock up dress would be made and fitted to her. The most skilled part of the procedure was drawing off the pieces and then cutting them properly. The dressmaker had to be able to see the pattern behind the fashion illustrations.
The muslin pieces would be used as pattern pieces when the material was cut. Then the fabric pieces would be pinned together. Many seamstresses then basted the seams. All this is the time consuming part. The customer was supposed to come for the final fitting wearing the stays she would wear with the dress. Dress makers did not usually make the stays. The dress would be tried on and any final adjustments made. Then seamstresses would sew all the seams and add any trimmings and tidy up the gown. The dress/gown was customarily pressed by the woman’s lady maid, not by the modiste’s workers.