Slim-fit blazers are being replaced by oversized cuts, allowing for layers.

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“Shapeless, slim-fit blazers that can’t take a sweater underneath were never really in, but I continue seeing people wearing them for some reason,” Bychkova told Insider.

Additionally, an unlined blazer doesn’t keep its shape, making it tough to style. Instead, the expert said to opt for an oversized blazer with defined shoulders.

If it fits your style, getting one size bigger than you normally would allows you to layer more underneath.