Cutting the frills refers to eliminating unnecessary or excessive features or details that add no value or are not essential. The opposite of this would be to add or retain more details and features, i.e., adding the frills. The synonyms for adding the frills could be embellishing, adorning, decorating or enhancing. Contrary to cutting the frills, these antonyms would signify adding more value or aesthetical appeal to something. While cutting the frills may be necessary at times, adding frills may help in enhancing the beauty and attractiveness of something that requires attention. Therefore, using the right amount of frills may add value to something and make it more appealing.