How did the protagonist look before losing the necklace?

Mathilde Loisel feels she looks glamorous and wealthy.

Madame Loisel was a success. She was the prettiest woman present, elegant, graceful, smiling, and quite above herself with happiness. All the men stared at her, inquired her name, and asked to be introduced to her. All the Under-Secretaries of State were eager to waltz with her. The Minister noticed her.