in addition to what is already said: when you are padding the canvas, a waxed cotton slights easier therough the layers of canvas, chest canvans and Domette and even more layers depending how elaborate your consturction is. When I worked with a German tailor we used silk thread for the padding as it is smoother than cotton fiberes by nature. Concerning the price highrer price of silk thread I think it doesn't really matters given the high quallity garment you aim to make.
Waxing a silk buttonhole twist is kind of tricky. By waxing the colour can change to a darker tone and it won't match anymore with the cloth. Further it looses part of its shine/gloss that you also do not want. Alternative, you can just iron the silk theard and it will not curl/tangle/snarl anymore. Think about that: befor you lay your pattern on the colth you iron it in order to let the fibers relax again after roling/folding on colth boards. By ironing the cloth 'shrinks' will say the fibers contract to their natural condition. The same happens when you iron the thread which is highly under tension because of the twining onto a bobbin.
In one of the videos Rory also say to pull the thread three four times between your hands and let it go. It releases the tension the the thread, too
Different people have different preferences, but in the past, I've only read or seen people using waxed thread for finishing: on hems and for buttonholes. Instead of silk for pick stitching, some people use waxed silamide thread, but I think I'd rather use silk.
in addition to what is already said: when you are padding the canvas, a waxed cotton slights easier therough the layers of canvas, chest canvans and Domette and even more layers depending how elaborate your consturction is. When I worked with a German tailor we used silk thread for the padding as it is smoother than cotton fiberes by nature. Concerning the price highrer price of silk thread I think it doesn't really matters given the high quallity garment you aim to make.
Waxing a silk buttonhole twist is kind of tricky. By waxing the colour can change to a darker tone and it won't match anymore with the cloth. Further it looses part of its shine/gloss that you also do not want. Alternative, you can just iron the silk theard and it will not curl/tangle/snarl anymore. Think about that: befor you lay your pattern on the colth you iron it in order to let the fibers relax again after roling/folding on colth boards. By ironing the cloth 'shrinks' will say the fibers contract to their natural condition. The same happens when you iron the thread which is highly under tension because of the twining onto a bobbin.
In one of the videos Rory also say to pull the thread three four times between your hands and let it go. It releases the tension the the thread, too