I bought a blouse about this time last year and have only worn it occasionally. The other day I realized what it was that I was having an issue with - the elastic in the hem.
This elastic made the back of the blouse ride up to the waistline in the back but was loose enough that the hem dropped down in the front. The result was very unattractive.
I decided to remove the elastic and re-hem the blouse so it would just hang free.
This is the result:
Such a simple fix!