Two blazers, two trousers, two shirts, one belt. The pieces are designed to work as suits, as separates, and as the spine of a five-day wardrobe.
A tailoring system isn't a uniform; it's a kit. Pick a blazer. Pick a trouser. Add a shirt that fits the day. The Single-Breasted Blazer pairs with the Straight Trouser as a clean suit; the Double-Breasted pairs with the Wide for a more dressed-up version. The two shirts swap into both. The belt finishes either.