Well! I just packed for my trip (following the guidelines of the great Sue of unefemme). Hence, I perforce HAD to wear things that were not in my suitcase for my last few days at home. That was the "other" 80% Wow! I have a lot of nice things that have not made it to my desired "cost per wear." There's some space in my case, and I was tempted to add a couple of these "new" nice things. I resisted. Looking forward to the "new" pieces.
If there's a method here (and I'm sure I'm too lazy to follow it, unless forced to by the necessity of packing) it would be to hide (for a while) your favorites and see if the results are agony (in which case say good-bye to the unfavored items) or, as in my case ecstasy (in which case wear them on your return).