Linen has always had an image problem. It creases the moment you sit down, and for decades that was treated as a flaw to be minimised, pressed out or blended away with synthetics.
The better view is that the creases are the point. Linen is made from flax, one of the oldest cultivated fibres, and its long, irregular threads give it a texture no machine-made fabric can imitate. It breathes, draws moisture away from the skin and becomes softer with every wash.
A linen jacket should look as though it has been somewhere.
Tailors who understand it cut linen a little looser, leave the jacket unlined or half-lined, and choose natural shirt buttons that will not look out of place as the cloth relaxes. The colours that work best are the ones flax produces almost by itself: oatmeal, stone, faded navy, the green of olive leaves.
In a hot climate there is no more sensible fabric. Wear it well, accept that it will wrinkle, and you will look more at ease than anyone else in the room.