Pillows are incomplete without pillowcases, as the Truly Trendy covers give the pillows beauty and charm. However, it is... morePillows are incomplete without pillowcases, as the Truly Trendy covers give the pillows beauty and charm. However, it is clear that different pillows require different types of covers. Therefore, it is important to distinguish between the different purposes of pillows. Bedroom pillows need a completely different Beautiful Silk Pillowcases than the ones used for sofa pillows and Beach Gym Yoga Towels.