How to use "peak" in a sentence

He was wearing a dark jacket and trousers, and a black cap with a peak

He wore a grey cap with a peak, a red handkerchief around his neck, and had the appearance of a sailor

In the case of Elizabeth Stride, from the descriptions by Constable Smith and Israel Schwartz we have a man between 28 - 30 years old, 1.65m to 1.70m tall, wearing dark clothes and a hat with a peak, or perhaps a deerstalker

If the woman was Catherine Eddowes, then the man was certainly Jack the Ripper: about thirty, of average height, with a small moustache and a cap with a peak.

He wore dark clothes and a hat with one peak, or two like a deerstalker

His ships, sealed in their glass worlds, relaxed him; he liked to spend time with them when he had a problem to work out or when he was on edge, for they made him feel serene, and that security allowed his mind to function at peak performance.