I made my husband a promise..but??

Okay,I am a 21 year old,5'0,Curvacious African American woman and my husband is 7 years older than me.We have been knowing eachother since i was 3 and he was 10.(Our families knew eachother).When we first started going out when I was 18,I made him a promise that i'd never wear anything sleazy(short shorts,short short dress etc.)and he loved the idea because he felt that my body was meant for his eyes only and not the whole world.But,i've never worn anything short in my whole life due to my parents,and my self respect.But I see women with somewhat short short dresses on and they look good and i know i'd look good in one to.I really want to wear my little black dress to his job banquet,but it shows too much leg?(Stops above my knee)Help?