Donnellan was not only a skilled interpreter of couture trends but had "a prescient understanding of fashion change". As hemlines rose and customers moved from couture to
ready-to-wear, Donnellan moved too. Although he did not close his couture house until 1971 – a period described by
The Times as "fashion anarchy" – he had begun consulting to mainstream and mid-price retailers, notably Marks & Spencer, from the 1960s. In his work for the dynamic mainstream fashion industry that was developing in the UK during this era, he was highly influential. His obituary notes: "he updgraded the cut and cloth of ready-to-wear clothes and became an overall advisor on mass-manufacture style." While some London couture designers were being criticised by the press by the late 1960s as being out of touch with the fashion trends, Donnellan was still considered influential. A 1970 review of his spring collection notes his skillful presentation of a new silhouette and quoted his guidance that if women didn't show the knees, they must define the hips. The review concluded: "It was a collection for 1970, entirely relevant to now – no nonsense about the twenties, the thirties nor the fifties." Donnellan was well placed to understand the move towards ready-to-wear – especially since he had been working with Marks & Spencer – and had begun including a few readymade items within his own couture shows from 1968, getting them cut and sewn in his Carlos Place workroom and charging around half the price of his couture lines. Donnellan closed Michael of Carlos Place in 1971; his obituary notes that he didn't blame the market or the times for this, instead citing the shortage of skilled tailors available to British couturiers. ==Legacy==