We always suggest going fairly snug with most denim as you will find that they will 'give' up to half a size when worn. As a rule sizing runs from 25-32 with a standard size 10 fitting into a 28 waist, therefore a size 29 waist would be equivalent to a size 11, 30 waist a size 12 and so on.
Designed to be worn fitted, wear true to size!