Vertical lines in apparel designing give the following effect –

Correct option is B

Vertical lines in apparel design are used to create an elongating effect, making the wearer appear taller and thinner. The visual perception of vertical lines draws the eye upward and downwards, which can add the illusion of height and slenderness. This is why vertical stripes or seams are commonly used in fashion to enhance the appearance of height and slimness.
Information Booster: The use of vertical lines is a classic fashion technique to manipulate body proportions. Whether in clothing or accessories, vertical patterns can have a slimming effect by guiding the eyes to follow the length of the body. In contrast, horizontal lines tend to make the body appear wider or more stout by drawing attention to the width.
Additional Knowledge:
· Make the person look more stout and short (Option a) is the opposite effect of vertical lines, which is typically created by horizontal lines or other visual patterns that emphasize width.
· Makes clothes very strong (Option c) refers to the structural properties of fabrics or stitching but is unrelated to the effect of vertical lines in fashion.
· None of the above (Option d) is incorrect as vertical lines do indeed have the effect of making a person look thinner and taller.