You can. There are rope halters that you can buy with all the hardware and some have the lead rope built in.
if u mean a shirt, the answer is simple. u simply take the two strings and tie them together around your neck or into a bow. depending on what you prefer.
See link below:
A lead rope and halter is used. The halter goes over the horses snout and ears (like a dog collar in a sense) and the lead rope connects to a ring on the halter.
lead rope and a halter(halter goes on the head and a lead rope attaches to a loop on the bottom of the halter
A halter fashioned out of rope instead for nylon or leather. Many times it is one or two continous pieces. They usually do not have the strength of a nylon halter.
To lead a horse you would use a halter and lead rope. The lead rope attaches to the halter.
One who halts or limps; a cripple., A strong strap or cord., A rope or strap, with or without a headstall, for leading or tying a horse., A rope for hanging malefactors; a noose., To tie by the neck with a rope, strap, or halter; to put a halter on; to subject to a hangman's halter.
A halter and lead rope. the halter goes on the horses head and the lead rope is the thing you hold.
See the related link for a step-by-step written process on how to make your own rope halter, and there is also a video as well. I advise you take a look at the written one first, because it tells you what kind of rope works best, and how much rope to use. Then you could use the video to show you better.
For halter breaking: Halter, Lead rope, Fence post, Lasso rope, Stall and a Cattle squeeze.....
rope cutter
A halter and lead rope. The halter is a thing made of leather, rope or other such material, and goes around a horse's head. The lead rope can be clipped onto the halter to allow easier leading.
When you take a horse out to a meadow or pasture you take a lead rope and a halter. The lead rope clips onto the halter so you can control the horse.
A halter and lead rope. It can be rope, nylon cord, or leather.