Quiet luxury is not a palette you can buy into. It is a set of decisions made before anything reaches a shop floor, most of them subtractive.
Strip the logo, and the garment has to earn attention some other way. Usually it earns it in the make: the weight of the cloth, the fall of a shoulder, a hem that behaves.
Read it in the seams
The tell is always construction. A machine can imitate a look; it cannot imitate the small, deliberate irregularities of a thing finished by hand.