I hope it's not too late to make an entry. If not my idea would be a sport suit, the idea being borrowed from
Sleevehead:
So what is a sports suit? The central idea behind the sports suit is the idea of “composito” (or composite). The idea is to “compose” a look by mixing and matching the sports suit's different components with other pieces in your wardrobe. Carefully of course, rather than indiscriminately. Growing up in southern Italy, Enzo remembers in particular a man in his town who did the sports suit very well.


Critically, the most important ingredient of the sports suit is the cloth and its pattern. The sports suit is executed as a three-piece suit and demands a cloth with a tolerant, versatile pattern which can live within an ensemble or independently. Practically, this excludes stripes. But what's left includes a broad range of patterns falling in between a glenplaid and a plain windowpane, as well as flecked, textured patterns such as a Donegal tweed.
Given the right pattern, there are at least 6 different ways to wear the sports suit. They are:
Full suit (matching jacket, vest, trousers)
Matching jacket and vest plus odd trousers
Matching jacket and trousers
Matching vest and trousers plus odd jacket
Trousers only plus odd jacket
Vest only plus odd jacket and trousers
The sports suit is meant to be an everyday suit but certainly not meant to be worn mindlessly or without effort. This bit of effort is very much aligned with a central idea in my planned book – the wardrobe as a cognitive and imaginative exercise. Not simply an exercise in self-absorption, but a genuine appreciation and respect for things in themselves – the autonomy of cloth, colors, and shape - and an ability to let their independence still somehow express the individual wearer of the cloth.
My ideal fabric would vary. Perhaps something similar to that pictured above or as follows:


(D. specifically)