It's actually a pair of loose fitting wool trousers.
I don't seem to fit into any of their measurements:
Size guide as follows in inches:
XS: 8, bust 33, waist 25, hip 36
S: 10, bust 35, waist 27, hip 38
M: 12, bust 37, waist 29, hip 40
L: 14, bust 39, waist 31, hip 42
XL: 16, bust 41, waist 33, hip 44
Im usually a 12. Bust 32, waist 29, hip 38. So which size to choose?