You can buy at army surplus stores finger and fingerless gloves. Black, blue and brown. The lower cost gloves are made of 100% Israeli Wool.
Most killer's would wear black as the color to stay hidden. This includes black gloves.
MILITARY ISSUE BLACK GLOVE INSERTS/LINERS The cold weather glove inserts are intended to be worn for added warmth with glove shells for cold weather. The black wool glove inserts can be worn on either hand. All parts of the glove, except the cuff, are seamless knit. The cuff is a true rib knit. Many artist and trail climbing guilds cut the finger tips off to give the hand added control. Black fibers can be transferred to other items. The crime scene found black fibers on JonBenet clothing. Material: 100% Israeli Wool.
Many artists and trail guilds will cut the tips off their gloves for better control like tying a knot. Wool fibers will easily shed off the cut ends of the gloves. Fiber like this was found at the crime scene and was trace as ISRAELI WOOL. Surplus store.
MILITARY ISSUE CLASS 2 CW TYPE II WOOL GLOVE INSERTS Perfect for the Cold Winter Months, these Fingerless Gloves will Keeps your Fingers Warm and Fit while allowing you to use your Finger Tips giving you a Great Feel. Black duct tape is a fix all material and is used by many artists and rock climbing guilds. The JBI Profile predict the killer wore Military Black gloves easily found at surplus and hardware stores located all across the US and Canada. These stores also sell nylon cords and black rows of duct tape.
The lab's profile predict that the killer wanted the crime scene to look like a foreign faction and use gloves made from Israeli wool.
The white tent cord can be found at these surplus stores too. It is used by rock climber and trail guilds to support their tents for the many nights out on the hick.
The gloves were most likely cut as soon as he got them, not at the crime scene. Yes as you pointed out, he could cut the gloves there to tie the many knots, but I do not support that.
The lab
Team JBI