normally, for a six it is 37-38 inches and 8 is 38-39 inches
A US women's size 8 is a European size 38 in dresses and suits. Measurements for this size is bust 35-inches, waist 27-inches, and hip 37-inches. A women's size 8 shoe in the US is a European size 6.
It also depends on your hip size, but generally that's somewhere between a size 6 and a size 8 (based on US sizes).
160cm babe
If the waist is 27"-28" and the hip is 37"-38", the ideal size is 6/Medium.
Size 8
It's around 35 inches, but will differ person to person.
Size 5 or 6
its roughly about a size 6-8
an 8 in women size
Size 6.
UK 8 EU 36 waist:28 Hip:38
Size 8 woman's = 5 or 6 Girl's