Concept:
After sewing, garments undergo finishing processes where final appearance, dimensions, and shape are corrected using heat and pressing operations.
Step 1: Understand post-sewing operations.
Ironing (pressing) involves:
• Heat application
• Moisture control
• Shape correction
Step 2: Effect on measurements.
Pressing can:
• Adjust slight dimensional deviations
• Set garment shape
• Improve final fit appearance
Step 3: Final conclusion.
\[
\boxed{\text{Ironing}}
\]
Thus,
\[
\boxed{\text{Option (D) is correct.}}
\]