-When you can wear boots without feeling like you will burst the seams.
-When your bra size goes down and you no longer have to wear the straps that look like they could stop a raging bull.
-When everything seems to fit just right.
And, my personal favorite:
When you go engagement ring shopping with your boyfriend and not only does the sales lady say you have small hands (I have always called my fingers my sausages) but you have gone down an entire ring size from the last time you got fitted for a ring.
(And yes, that is true, by the way.
)