From this passage you can infer that:

From the passage given, it can be inferred that Omelia is disappointed that she can't find something to wear for her own dinner party. This is indicated by her grumbling, sighing, scowling, and throwing her hands in the air in disappointment. Additionally, her actions of trying on different clothes, being dissatisfied with them, and ultimately discarding them onto a growing pile suggest her frustration and dissatisfaction with her wardrobe choices for the event.