My essentials are really boring, but it is their nature.
1. Simple blazers in navy, black and gray for winter and navy, gray and white for summer.
2. Simple straight leg trousers in navy, black and gray for winter and navy, gray and white for summer.
3. Crew neck merino and cashmere sweaters in navy, black and gray for winter.
4. Crew neck cotton 3/4 sleeve sweaters in navy, gray and white for summer.
5. Dark wash straigth leg and bootcut jeans.
6. Black booties and black knee high boots for winter
7. Silver pumps and silver sandals for summer.

I used to have pencil skirts and sheath dresses in navy, black and gray, and cardigans in all neutrals but i don't wear them much lately, so not on the list anymore. Also black pumps became not essential.

I prefer my outerwear and my bags to make statement and don't have essentials in those categories.