I am not sure where the idea that all dressmakers were prostitutes came from but I bitterly disagree!, my family came from the North East and in small areas where everyone knows each other this would not be possible, in London where people are anonymous , well you have your own morality!.
NOT in my family!!.dearie.
Something is amiss with your understanding of the circumstances whereby a dressmaker was also a prostitute. The two occupations are not mutually exclusive of each other......
I grew up in a small rural community, thousands and thousands of miles from London. There were ladies of the night in that small rural community, just as surely as there were ladies of the night in the small area where you were raised.
I attended primary school (an all girls school) with a lass whose mum was one of those ladies of the night. My school friend's father's name likely is NOT on her birth cert, but my school friend certainly knew which local funded her school uniforms, school excursions, and bought books for our school library and presented awards at end of year functions.
This was of course post WWII, rural New South Wales. My school friend's mum was a lovely lady, and was a fine seamstress, for my school friend's clothes were all delicately handmade and the envy of the entire girls school. Our end of year Christmas plays were always in costumes that that lady of the night prepared.
Cheers, JM