In October 1985, the Dolce & Gabbana brand made its fashion show debut at Milano Collezioni's Nuovi Talenti (New Talents). In March 1986, D&G released its first collection and held its own show..Wow nice, is it the first show of D&G line ?
I was about to suggest you contact the person who uploaded this video but I guess you did that already. Long shot but perhaps Fashion Channel has footage?