There is nothing wrong with dressing in a simple, monochromatic way.  In fact there is so much right about it.  This style of dressing is classic.  Simple, yes, but very chic and stylish. Basic, yes but so very luxurious in an understated way.  Take these looks below for example.  They make the case for owning good quality clothes - black pants, white sneakers, cream cashmere sweaters, white jeans et al - pieces that everyone should own in some way, shape or form.  And whats best is that they never go out of style.