Co-ords make the relationship between separate pieces part of the outfit. Sandro Qatar's women's co-ords and two-piece sets provide a starting point for coordinated dressing, with shoes helping set the occasion and a bag adjusting the scale of the finish. Keep those supporting elements quieter if the clothing already reads as a complete statement.
Consider the individual product descriptions when choosing, including what each listing contains. Coordinated pieces can also prompt new combinations with clothing you own, so imagine the upper and lower silhouettes in more than one setting rather than limiting them to a single look.