What are the core pieces for a business casual capsule wardrobe?

[Mia59]

I'm trying to build a capsule wardrobe for my office job to simplify my mornings and reduce clutter, but I'm stuck on the foundational pieces. I work in a business casual environment where blazers are common but not mandatory, and I need pieces that can transition from meetings to after-work events. I'm looking for advice on specific, high-quality essentials like the perfect pair of trousers, a versatile dress, and a layering piece that aren't just basic black, but will actually mix and match for a whole season. What are your must-have items that get the most wear?