Slice the peaches thinly, making about 12 - 16 slices per peach.
Combine the peaches in a bowl, sprinkle with sugar and toss gently to mix. Pour the white wine and toss gently again.
Cover the bowl and store in the fridge from a few hours or up to a day.
Serve the peaches very cold, straight from the fridge, with a small ladleful of their pinkish orange liquid.