Interlining is a material used to reinforce fabric and improve the structure and appearance of a shirt. It has an important impact on the shape and stiffness of a shirt, which is mainly reflected in the following aspects:

1. **Influence on shape**:
Interlining can help China Shirt Interlining Fabrics maintain the shape of a shirt by increasing the stiffness of the shirt. The shape of a shirt is mainly determined by the type, thickness and quality of the interlining. For example, thicker interlinings usually make the shoulders, collars and cuffs of a shirt more three-dimensional, thus ensuring that the shirt maintains a good sense of structure. In addition, the application of interlining can also help the shirt fit the body curve better, avoid looseness or deformation, and make the shape more three-dimensional and refined.

2. **Improve stiffness**:
One of the main functions of interlining is to enhance the stiffness of the fabric, especially in important parts such as the collar, cuffs and shoulders of the shirt. Stiffness refers to the stability of the shirt's shape when it is worn. Shirts without interlining tend to be softer, easily deformed, and lose their refreshing and upright effect. Shirts with suitable interlinings can better resist gravity and external pressure, keep the collar upright, the shoulders shaped, and even prevent the shirt from excessive wrinkles, improving the overall appearance.

3. **Affecting comfort and breathability**:
The material of the interlining also affects the comfort and breathability of the shirt. Common interlining materials include cotton, polyester, nylon, etc. Improper material selection may affect the comfort of the shirt. If the interlining is too thick or too hard, it may not be breathable enough when worn, causing stuffiness or friction discomfort. Soft and breathable interlinings can increase the comfort of wearing while providing a good version.

4. **Affecting the durability of the shirt**:
Interlinings can also improve the durability of the shirt, especially in areas that are prone to wear, such as the collar and cuffs. By reinforcing these areas, the interlining can effectively prevent the shirt from deforming or breaking during long-term wear, thereby extending the service life of the shirt.

In general, interlinings play an important role in the version and stiffness of the shirt. It not only determines the shape and structure of the shirt, but also affects the wearing experience. Choosing the right interlining can help your shirt strike a balance between appearance and comfort, and show its best effect.