Oh, I just posted on Angie's blog similar to Gaylene's interpretation.
But in thinking about this some more, I think 'essentials' only make sense if you are a uniform dresser.
Case in point: This summer I purchased clothing that enabled me to wear several different silhouettes (midi skirt, tube skirt, skinny jeans, boot cuts, short shorts, and shift dress) . Each outfit was kind of independent - I didn't mix and match much, and I can't say there was a set of essentials that glued it all together. HOWEVER, the colour scheme sort of tied the wardrobe together, as did the general casualness of all the pieces.
This winter though, I have a uniform of skinny bottoms and t-shirts and sweaters so I would consider those essentials.