This sweater is neither very wide nor tight-fitting. I'd say it's a very "normal" sweater in terms of volume.
Size 0/1 corresponds to a 36/38; size 2/3 to a 40/42 and size 4/5 to a 44 or small 46.
Long" option
T0/1: chest width 50 cm and body length 57 cm
T2/3: chest width 53 cm, body length 59 cm
T4/5: chest width 56 cm, body length 61 cm
The length is long enough to suit taller girls (> 170 cm, for example) or those who prefer longer sweaters.
Short" option
T0/1: chest width 50 cm and body length 51 cm
T2/3: chest width 53 cm, body length 53 cm
T4/5: chest width 56 cm, body length 55 cm
The length is quite short and is best suited either to petite girls or those who prefer their sweaters a little shorter.
For example, I'm 165 cm and a size 36, and the Chiara T0/1 fits me perfectly, as I don't like to wear sweaters that are too long.
You can also see the difference between the 2 lengths on the last photos of the carousel or at the bottom of the page in the "more silhouettes in Chiara" tab.
Thank you!