Which fabric feature is crucial for maintaining the shape of garments?

The yarn type is indeed crucial for maintaining the shape of garments because it directly influences the fabric's stretch, recovery, and overall structure. Different yarn types can create varied textures and levels of elasticity in the fabric, which is fundamental to how a garment fits and holds its shape over time. For instance, yarns with a higher stretch percentage can allow a garment to conform more closely to the body while still retaining its original form after being worn, washed, or subjected to movements.

In contrast, other features such as weight, durability, and seam placement are important for different aspects of garment performance but do not have a direct impact on shape retention. Weight relates more to how heavy or light the fabric is, which can affect comfort and drape but not necessarily shape stability. Durability is a measure of how well the fabric withstands wear and tear, influencing the garment's lifespan rather than its shape retention quality. Seam placement plays a role in the aesthetics and construction of the garment, affecting how it hangs and fits, but does not inherently dictate the fabric's ability to maintain its shape over time. Thus, the yarn type is the key factor in ensuring that garments remain well-structured and maintain their intended fit.