Tweed jackets, formerly associated with formal wear and women's fashion, are now gaining popularity as a versatile 'borderless' fashion item for men. Originally used in men's hunting attire, tweed has transformed into a gender-neutral and casual fashion staple. Brands like Dunst and Musinsa Standard have launched casual versions of the tweed jacket in their spring/summer collections, appealing to the modern 'Big Blur' trend that blurs the lines between genders and style types. This shift has led to high demand and sold-out models, marking tweed jackets as a trending item in South Korea this season.