This dress can also be adapted for an adult and you can also make just a sweater with a hat.
In this tutorial you will find many pictures that will help you during the work.
And also this written pattern has the tutorial for the dress and for the hat.
I use 3 skeins for a 9-year-old girl . My advice if you want to use the same yarn is to buy in plus 1 skein.
You can use any tipe of yarn you want only to be soft and suitable with the crochet nr. 5mm
Yarn : Yarn Art Bellissimo
Crochet nr. 5 mm
crochet nr. 4 mm