Any hoo quilt for bed. I know you don't want to give away secret of what your doing and ruin surprise. My suggestion is atleast 90 to 100" inches long and since the matress is about 35 to 37 inches wide I suggest about at least a 70 to 75 inch wide on that. My hubby's matress is 82 inches long and the will differ on both width and legnth depending on the brand of matress. The companies all use different brands depending on the price. One year they may buy this brand and next year a different , because of the incentive or deal that they are being offered. I have taken my own twin and put into a truck because I couldn't sleep on the company's matress and get a decent nights sleep. Just made sure I replaced their matress when I tturned in the truck or had to switch trucks. Good luck , and Happy Holidays!!