About the characteristics of "Non iron plus". This term refers to garments or fabrics that have enhanced wrinkle resistance and often include additional features for a superior finish.

The question asks about the characteristics of "Non iron plus". This term refers to garments or fabrics that have enhanced wrinkle resistance and often include additional features for a superior finish.

Let's evaluate each option:

• A. DP 3.5 | wrinkle resistance | taped seams | pucker-free

  • DP stands for Durable Press rating, which measures a fabric's ability to resist wrinkles. A DP rating of 3.5 is considered a good standard for non-iron fabrics.
  • Wrinkle resistance is the primary characteristic of "non-iron" products.
  • Taped seams are often used in high-quality non-iron garments to prevent seam puckering and enhance durability, contributing to a smoother overall appearance.
  • A pucker-free finish specifically addresses the issue of seams not lying flat, which is crucial for a truly "non-iron" look.
  • This option describes a comprehensive set of features directly related to enhanced non-iron performance and quality.

• B. 100% cotton | DP 3.5–4.0 | taped seams | split yoke + 2 darts

  • While 100% cotton can be treated to be non-iron, "Non iron plus" doesn't necessarily imply 100% cotton; blends are also common.
  • DP 3.5–4.0 and taped seams are relevant.
  • Split yoke + 2 darts are tailoring details related to garment fit and construction, not directly to the non-iron treatment or fabric performance itself.

• C. DP 4.0+ | Japanese tech fabric | mesh weave | premium unwrinkle

  • DP 4.0+ indicates excellent wrinkle resistance.
  • Japanese tech fabric and mesh weave are very specific fabric types/origins. While some premium non-iron fabrics might use these, they are not universal defining characteristics of "Non iron plus".
  • Premium unwrinkle is a descriptive term for high-quality wrinkle resistance.

• D. Synthetic blend

  • Many non-iron fabrics are synthetic blends due to the inherent wrinkle resistance of synthetics. However, this is a general statement about composition and doesn't capture the "plus" aspect or specific performance features.

Option A provides the most accurate and comprehensive description of what "Non iron plus" would entail, focusing on both the core wrinkle resistance (DP 3.5, wrinkle resistance) and the enhanced construction quality (taped seams, pucker-free finish) that contribute to a superior non-iron product.

The final answer is $\boxed{\text{A}}$