I visited my sister last weekend and we had a bra sew-a-long. I made up my next iteration of a self drafted pattern and for her, we cut up one of her existing bras to make a pattern.
It was the first time she had sewn a bra so we set up our machines side by side; I sewed each step first and then she copied it. I'm not sure what everybody else does for fun on a Saturday night, but we had a very pleasant evening! Of course, I had an easier time of it, because I was using Liberty, which is a dream to sew, and she was using a slippery lingerie lycra.
My fabric is a bit more muted than the photograph shows; shame really as I like the brighter photograph.
The knickers were a bit experimental, as I was using a woven fabric for the front and a knit for the back. I started with a Jalie pattern and added 4 cm to each side seam of the front. This was based on a rough calculation that I did when I was nowhere near my sewing....I was guessing an 80 cm circumference, needed to add on the 10% negative ease that I was guessing Jalie used for their pattern, then added in an additional 10% ease. Not far off, but the fabric is taut across the front, so probably 1 - 2cm more each side would be better. I had forgotten that the Jalie pattern has a narrower front than back, and now that I have made them, I've measured a circumference closer to 95 cm when worn. I cut the front on the straight grain, but probably a bias would be better. Very comfy all the same, and now I know that I can combine a woven with a knit. I just need to get a little ribbon bow for the front.
Just for comparison, here is a link for a Liberty bra and briefs on net-a-porter (not current stock), totaling 170 British pounds!