When fashion articles talk about lines, it could figuratively refer to the symmetry that the look produces or it could literally mean the visible lines on the garments.
Visible lines can be created through print, cut and sew, fabric blocking amongst other techniques and quite often the results can be stunning despite the minimalism.

The crucial thing to note when working with visible lines is that it can change the illusion of your body shape. Understanding that and using it wisely can work in your favour while not having thought through its ability can result in a fashion faux pas. It is important to consider your body shape and what you want and do not want to accentuate.

In this outfit the idea is to elongate the legs while extending a cohesion to the upper  body with a statement shirt made up of lines. The next time you feeling like blurring the body with lines, try

1) wearing a pair of trousers with vertical colour blocks/detailings (to lengthen the lower body)
2) sticking to to a neutral tone (so the statement lines speak for themselves)
3) clothing with diagonal lines (this will make you stand out from the usual horizontal or vertical lines).

Shirt Kris Van Assche | Trousers Acne | Belt ASOS | Socks Bonds | Sandals Prada | Visor Fleet Ilya (similar) | Glasses Kris Van Assche for Linda Farrow