My waist & hip measurements are close to yours and I've now officially arrived at the smallest jeans size I can get in my country. Some brands don't even offer it. I've bigger boobs, a 35,5 inch chest, looking at sizing charts I should wear a size 8-10 with that measurement, in reality I fit into the equivalent of a size 2 or 4 (size 2 is the smallest we have here, size 0 doesn't exist).