Laudator Temporis Acti

Sue Prideaux, I Am Dynamite! A Life of Nietzsche (New York: Tim Duggan Books, 2018), p. 70, with note on p. 411:

Once, just as he had returned from his usual Sunday visit to Tribschen, he asked one of his students casually where he might find a good silk shop in Basel. Nietzsche eventually had to admit to his student that he had undertaken to shop for a pair of silk underpants. For reasons best known to himself, Wagner wore tailor-made silk underwear. This important commission filled Nietzsche with anxiety. Directed to the daunting shop, he squared his shoulders manfully, observing before going in, "Once you've chosen a God, you've got to adorn him."⁹

9. "Zwei Nietzsche Anekdoten," Frankfurter Zeitung, March 9, 1904, quoted in Millington, Richard Wagner, p. 153.

Id., pp. 164-165, with note on p. 415:

The Wagners were also wintering in Sorrento, in the Hotel Vittoria, close to the Villa Rubinacci. The only contact between Nietzsche and Wagner since the Bayreuth Festival had been in September, when the Master had written out of the blue to request Nietzsche to buy some silk underwear in Basel and post it to him. When he received the letter, Nietzsche had been so ill that he was unable to put pen to paper but he organized for the underwear to be purchased and posted, and he dictated a long and affectionate letter to accompany it. The letter expressed unaffected delight at being of service: the little commission had brought back fond memories of the happy times at Tribschen.¹¹

11. Nietzsche to Richard Wagner, from Basel, September 27, 1876.