Patterning a tube blouse... A step by step way of creating my design.

I will be giving a brief step by step method of patterning the blouse... Hope you like it and can come handy sometimes
Firstlywe pattern our normal bodies block.which consist of the shoulder,half length,bust point,under bust,your armhole,full length of the blouse. Then we come down by any inches you want for the start of your tube.but am making use of 6" ,so 6" down you mark it.
You mark out your bust span which varies but am making use of 7".which I have to divide by 2 because am patterning on fold,which gives us 3.5" which u mark from the center front on the bust line,under bust line and the waist line.
You subtract your round under bust from your round bust then divide by two ( e.g 34.5" -33'=1.5" ÷2=0.75" ) we then mark out 0.75" from the from the bust span line one both sides on the under bust line.then we go to the neck line mark out 1" from the bust span line on both sides.let both meet at the bust point.
Moving to the back.
The back of a tube blouse or gown is always lower than the front. So being we. Went down b 6" for the front we add extra 3".which means we go down 9" for the back. We mark out the zip allowance then mark out the bust span from the center back on the waist line,mark 0.75" on both sides shape it out to meet the neck and the hem line. Then we cut it out.

I will make a video next time so you see the process properly.
Thanks for your time