Neckline/ˈneklaɪn/ Definition 1 of 2Pro Tip 1/3Fashion Terms Understand different neckline types to describe clothes accurately. That sweater's turtle neckline is perfect for chilly weather. Pro Tip 2/3Cultural Significance Neckline depth can vary by culture; what's modest in one may not be in another. Her traditional blouse featured a modest, high neckline. Pro Tip 3/3Event Appropriateness Some necklines are more suitable for formal events, while others are casual. He chose a shirt with a formal, banded neckline for the interview.