Adjusting a backless tuxedo vest. Figure 1: Adjust length of vest by sliding the adjustment bar, behind your neck. Figure 1 Figure 2: Fasten the back of the vest at your waist. Figure 2 Figure 3: Adjust waist firmness by sliding the adjustment bar. Figure 3 Figure 4: Tuck remaining strap into vest strap pocket. Figure 4 Pants: Adjusting the Waist Vest: Adjusting Backless Vest Adjusting Full Back Vest Shirts: Adjusting Shirt Using Cufflinks Using Studs Accessories: Adjusting Bow Tie Adjusting Zipper Ties