Based on his poetry alone, it would be easy to assume that Herrick was a bit of a lothario. After all, much of his stuff was about women and their wiles. All of the so-called Julia poems fit these criteria; some of them are more romantic than others, and some are a little more bawdy (like, oh, "Upon Julia's Breasts"). "Upon Julia's Clothes" isn't just a poem about Julia's clothes; it's also a poem about the Speaker's feelings for Julia, who's quite the catch. He describes her clothes in such rapturous words ("vibration," "liquefaction") because he feels strongly for her—maybe even loves her—or at the very least has been struck by her beauty and charm. Keep your eye out for more lovely ladies in the rest of Herrick's work.