The relationship between environmental protection and fashion is getting closer and closer, which is one of the most important research topics in the fashion industry in recent years. Environmental protection is not only a call. More and more brands pay more attention to environmentally-friendly capsules, and plan to cover environmental products in the main series. Fashion companies are using practical actions to carry out environmental protection. For knitwear, yarn has become the most critical link in environmental protection. More and more enterprises begin to consider whether the yarn is pollution-free, degradable, recyclable, energy-saving, low-consumption and harmless to human body. This report starts from the connection between sustainable development and knitwear, and aims at the controllable cost and quantity production to extract three key trends: recycled cotton, environmentally-friendly tencel, and recycled polyester made from polyester waste like mineral water bottle.

In S/S 2021, the silhouette is changed and accessories like buttons also change along with the style. According to the collection of the latest information, the original metal flat buckle are widely applied to styles in S/S 2021. Resin buttons appear frequently every spring. But in S/S 2021, the most widely applied buttons are the cloth-wrapped button and the button with different materials, becoming an important trend for the young lady style.

In the 19th century, crocheting gradually became popular in Britain, America and France. It was mainly used to repair broken lace, so that the crocheted pattern was mostly flat lace. Crocheting is exposed, elastic, compact, soft and flexible. Different crocheting stitch can create different elasticity. Crocheted cutout can well integrate with clothing. It is also applied to woven fabrics like denim. But crocheting is more compatible with machine woven pieces of knitwear. In S/S 2021, crocheting will abandon the stereotype of folk style. Plain colors, melange yarns and placement crocheting are adopted to make crocheted clothing more fashionable and daily.

The fast-paced city full of competition begin to make people feel tired, and people begin to think about the balance between man and nature, man and environment, man and things. It is not only the physical need, but also the psychological need to be not crowded, and be free to stretch. This trend influences the development of knitwear, first on stitch crafts. How will the comfortable seamless unibody process create silhouettes of knitwear? The basic stitch of knitwear is inspired by the irregular pleats of DuPont paper to interpret the crinkled style. The faveolate texture brings the temperature of nature to the wearer. The flowing architectural texture renews the twill. Splashing reflects the importance of "integration" in the new season. The cold plate mark relief is combined with knitwear to make knitwear styles more 3D and inclusive.

The art expressed by light and shadow is quiet and elegant stars in the sky, just like the sunlight sprinkling through the treetops to the ground. In S/S 2021, the development of yarns is inspired by the hazy and low-key mysterious temperament of light and shadow changes. The sparkling but low-key summer yarns need to be skin-friendly, dry, comfortable, soft, and draping. In order to conform with the trend of environmental protection, summer yarns highlight more the traceability, recycle and reuse of resources.

In the S/S 2021, the yarn trend for the simple and sophisticated style is the minimalist and comfortable. It is full of vitality and pays attention to details. It advocates originality, handicraft and history, and creates a new fashion style for the traditional yarn. This report selects six kinds of yarns to analyze, and they are cashmere, mohair, transparent yarns, tape yarns, loop yarns and melange yarns.

The soft and graceful lady style is back. As one of important fabrics which show female styles, lace fully displays the elegant and romantic temperament of females. Lace is eye-catching and luxurious. And it boldly integrates fabric, craft and design to create a unique style. Exquisite lace and light sheer gauze present a light, sexy and elegant female image through the barely-there gauze.