"More low-necked" is a phrase frequently used to describe clothing with a deeper neckline than usual. However, there are several synonyms for this phrase that can be employed to add variety to your vocabulary. Some possible options you might consider include "plunging," "deep-cut," or "v-necked." Other descriptive words that can also be used to depict this style of clothing include "revealing," "sultry," or "daring." Ultimately, the synonym you choose should be based on the context and tone of the situation, as well as your personal preference for word usage.