See the MICAELA SHORTS pattern here

BIKINI TOP:
Sizes: S - M - L - XL - XXL - XXXL
Materials:
DROPS MUSKAT from Garnstudio (belongs to yarn group B)
100-100-150-150-150-150 g color 29, old pink

DROPS CROCHET HOOK SIZE 4 MM / G/6 – or the size needed to get 18 double crochets and 9 rows on 10 cm / 4’’ in width and 10 cm / 4’’ in height.