To adjust the top to your size, play with the number of double crochets you work in the row. For sizes above M, the group should be above 8, 9, 10, and more dc stitches.
For a size below M, the group of double crochets should be: 6, 5, 4.
Or if you prefer not to change the number of double crochets you work in the row, add an element or decrease by: 2dc-ch2-2dc.
The choice is yours.
Ch4, sk 8 ch, in 9th ch work: 2dc – ch2 – 2dc
Ch1, sk 3 ch, work 7dc
Ch1, sk 3 ch, work: 2dc – ch2 – 2dc
Ch1, sk 5 ch, in 6th ch work: 2dc – ch2 – 2dc
Repeat the sequence: 7dc, ch1, 2dc – ch2 – 2dc, ch1…
End row with 7dc, ch1, sk 3 ch, in 4th work: 2dc – ch2 – 2dc, sk 3 ch, 1dc.
Row 2
Work the same as Row 1, always stacking the groups (2dc – ch2 – 2dc above 2dc – ch2 – 2dc, 7dc above 7dc).
Continue working rows following the chart until you reach underarm height.