It means combining a tweedy jacket, usually long and lightly fitted, with a dress in chiffon or another thin, sheer fabric.

He wore the same tweedy jacket as before, but had changed into a fresh T-shirt, this one featuring a brightly colored illustration of Astro Boy.

His tweedy jacket was more crumpled-looking than usual, and he yawned as he spoke.

Or, instead of a skirt, the tweedy jacket might be accompanied by easy trousers in wool voile, transparent enough to show the over-the-knee stockings worn beneath them.

He wears brown wingtips and has thrown a tweedy out-of-season jacket over summer chinos.

Without uttering another word he whisked on his tweedy jacket and plunged out through the French windows, followed by Professor Slocombe.

John Nash looks eminently professorial, with his tweedy brown jacket, gray hair and wrinkled face.

His hair flows below his shoulders; he wears tweedy jackets.

Cords and sea-green pullover, a tweedy jacket with elbow patches, toffee-colored hair artfully ruffled by the breeze--he made, Gemma thought, a pretty picture indeed.

He looked splendid in a tweedy jacket and turtleneck sweater, the perfect image of a literary adjunct.