in my opinion the long fit jackets are better than the loose fit
here is their size chart, loose fit is more lose around the chest with longer sleeves
SizeChestWaistHeight
XS
30″ - 32″ / 76.2 - 81.28cm
28″ / 71.12cm
5′8″ - 6 / 172.72 - 182.88cm
S
34″ - 36″ / 86.36 - 91.44cm
30″ / 76.20cm
31″ / 78.74cm
M
38″ - 40″ / 96.52 - 101.60cm
32″ / 81.28cm
5′10″ - 6′4″ / 177.80 - 193.04cm
33″ / 83.82cm
L
42″ - 44″ / 106.68 - 111.76cm
34″ / 86.36cm
XL
46″ - 48″ / 116.84 - 121.92cm
36″ / 91.44cm
XXL
50″ - 52″ / 127.00 - 132.08cm
38″ - 40″ / 96.52 - 101.60cm
6′2″ - 6′5″ / 187.96 - 195.58cm