Such equipment is often disparagingly referred to as “boob armour”. It mainly serves to highlight the breasts. Infamously, for the “Sand Snakes” – a group of female warriors who appear in season 5 of Game of Thrones – the costumer even included nipples! Strange as it may seem, there do seem to be ancient antecedents for such armour. In her book, Mayor includes an ancient Greek vase-painting (fig. 5.1 on p. 90) that depicts an Amazon in what appears to be a metal cuirass with moulded breasts.
Needless to say, such armour isn’t very practical. As Mayor explains, “cone- or dome-shaped projections would direct the force of blows of weapons toward the sternum and heart. Even a fall could be fatal, causing the sharp metal separating the breast hollows to injure or even fracture the breastbone. Therefore, armored fighting women in antiquity would have worn padding under chest plates shaped exactly like the men’s, presenting a flat surface or a ridge down the center to deflect blows away from the heart” (p. 93; original emphasis).
You could do a lot worse than read the Wonder Woman books. The name of the island of the Amazons, Themiscyra (spelled Themyscira), is taken from ancient sources (it’s an area in Turkey), and a lot of Wonder Woman’s allies and adversaries are taken from or inspired by Greek mythology.
The comic offers a good example of the re-use and re-invention of ancient stories and motifs. No one would be able to write these stories without some knowledge of the ancient world, and I think that readers will appreciate the stories more when they are themselves familiar with Greek mythology.
If you’re interested in delving into the comics, a good starting point, I think, would be the New 52 series of Wonder Woman comics written by Brian Azzarello. Naturally, you should also check out the books by Jill Lepore and Adrienne Mayor, cited above.