Quite possibly the biggest trend to emerge in 2020, the shag haircut is a nod to the '70s — but there are different variations. "The two popular shag styles are the ultra curly, ultra layered and then straight with long curtain bangs that sweep," said Toth. "The curly shag is very round with a pure release of texture. It will be a seamless transition from bangs to short layers to long layers to bottom length. The straight shag can be styled however you want, but it generally has longer layers with the focus of the style being the bold curtain bangs — sweeping but not fully connected to the rest of the style."