If this were written by a third-grader, the mistakes might be understandable. But coming from a professional writer for Yahoo! Style, they’re downright disgraceful:
Someone writing about fashion should know that paillettes needs two L’s; they are a type of sequin. And when the plural word is the subject of the sentence, it requires a plural subject. And Lord help her (because no one at Yahoo! will), the writer actually thinks that graceful is a suitable modifier for the verb floats. It is not; the adverb gracefully is.