How much weight do i need to lose to drop a pant size?

xoxsashaxox

Hi there! Im currently a size 3, 124 pounds and 5'5. I have heard the less you weigh to start the less you need to lose to go down a pants size. How much would i have to weigh to fit into a size 2? It took me 14 pounds to drop from a 7 to a 3 (2 pants sizes). But now that im thinner than before would i need to lose less weight if i wanted do drop to my goal size of 2?