This Silver Costume is worn in Quantum Leap: Future Boy - October 6, 1957 (1991) on Scott Bakula as Sam Beckett and worn in V.I.P. in Deconstructing Peri (1998) on Leah Lail as Kay Simmons
Today in the Department of Before They Were Star Trek Stars, Leonard Nimoy guest stars in "A Quality of Mercy," episode 15 of the third season of The Twilight Zone (original air date December 29, 1961). Nimoy plays the radio operator of a U.S. Infantry unit in the Philippines, in the final days of WWII.
The unit is put under the command of an inexperienced, glory-hungry young Lieutenant (Dean Stockwell) who wants to take them on a pointless, dangerous raid while there's still time to make a name for himself. Instead, he finds himself transported, Quantum Leap-style, into the body of a Japanese officer. When he comes back to his own body, his newfound sense of perspective leads him to call off the raid just before they get the news from Hiroshima.