The famed milliner found the late screen legend to be a "sweetheart" when they met and was pleased he was able to surprise her with the extravagant present after she originally only requested a hatpin.
He recalled: "A couple of years ago, I got a phone call, would Mr. Treacy make a hatpin for Elizabeth Taylor? I said, 'Might Miss Taylor like a hat to go with the hatpin?' and The Answer was yes.
"I went to see her at the Dorchester. I didn't know whether I was going to be dealing with a very tricky person but she was a sweetheart.
"I thought it would be entertaining to do a hat show on her in her room - because, after all, she is an old lady. I tried 25 hats on her.
"She kept saying, 'Which hat can I have?' And at the end I said, 'You can have them all.' I gave her 25 hats.
"She said, 'I must do something for you in return.' But I'd got my return just by hanging out with her."
He added: "I love the romance of what I do, although because of Isabella, Lady Gaga and Grace Jones, people think I have crazy customers. Sometimes I get more enthusiasm from the housewife who wants a hat and believes in it."