A trench coat should strike the perfect balance between comfort and style, fitting well over layers without feeling restrictive. The shoulders should align naturally with your shoulder line, ensuring a structured and polished appearance. The sleeves should end right at your wrist bone, providing coverage without extending too far or feeling too short. Around the chest and waist, the coat should feel snug but not tight, allowing for easy movement and sufficient room to wear sweaters, blazers, or other layers underneath. The length of the coat is also important—ideally, it should hit just above the knee or mid-calf, depending on your height and preference, to maintain its classic silhouette. A properly fitting trench coat not only offers warmth and comfort but also enhances your overall look with timeless sophistication.