Tops. I never have enough waist-defining tops.

The only thing I can think of is a belt. I don't own one and could use one for a couple pair of skinny cargo pants I have that are too big in the waist.

I have though of more wardrobe holes from reading others
ditto to
-shoes
-jackets
-woven cool summer tops

I have some temporary ones at the moment too, but that is because I haven't started new season shopping yet.