You don't wanna size down on them... You wanna size up. Unlike most japanese denim makers which shrink to tagged size, LVC shrink FROM tagged size.
If you are a natural 30 waist you'd want to get at least a 31-32 tagged size. Since it'll shrink 2 inches or so depending and then stretch a little with wear.
If you sized down 2, 28, they would shrink to a 26 which is probably unwearable.
in my experience with LVC this is only true if you're referring to the 1947's. besides those I'd go so far as to say that ALL LVC models are a bit oversized (at the waist) so therefore you dont really need to size up, even though they're stf...