Pink and blue are often used in combination for bridesmaid dresses and wedding themes or in women's suits. Adding grey would match well and provide an upscale look. It depends what shades of each color are used to determine how well they match.
Some shades that match well are dark blue and a soft pink. A soft grey accent scarf or blazer would look sharp, yet still feminine. There are men's ties that are blue, pink and grey in color. In most cases, these colors compliment one another and match well. Interior designers use pink, blue and gray to create a relaxing color scheme.