This is a partlet that I made for a prize auction tourney in 2010. The embroidery was done in double running stitch with black linen thread. The ground fabric was also linen.
The under arm seams were not joined. Images such as those found on the roof of the Pitti Palace in Italy suggest that partlet pieces were not joined under the armpits (Janet Arnold, Patterns of Fashion 4).This would allow for fluctuations in weight. For my own personal use, I have some that are, and some that are not. Since I often have no-one to help me dress, I find that the joined ones suit my needs better. However, I chose a more accurate representation for this project.
During the embroidery, I often felt that I would go cross eyed! One of the disadvantages with some of the water soluble pens is that the ink has a tendency to bleed and blur the lines of the design. Once I washed the collar piece out and ironed it, I felt that the effort had been worth it, and I was very pleased with how the project turned out.
This website has some great pictures and interesting research on partlet construction- http://katerina.purplefiles.net/FlorenceFiles/FLUnderthings_Giorgeria.html