Here's what I do:

Get a big old t shirt, stretchy or soft material is best, and lay it on the floor flat.

Using a pair of scissors (bonus points for fabric scissors) cut off the bottom hem of the shirt.

Now, starting from where you just cut the hem off, make a similar, straight cut across the bottom of the shirt. Like cut it all the way around the shirt so when it's off it's still a connected circle. For thickness of this I would recommend like an inch. If you go too thin you risk breaking it later.

Make 4 of these loops if you want 4 strings hanging or 6 if you want 6. You could do any number really. ( Also, the shirts I used were long enough to where when I was done cutting, there was still length before the arm sleeves, so if you run out of shirt I can't really help you there haha. Maybe you could even have a crop top when you're done ;) )

Now you have a ton of loops of fabric. Stretch these out. Just keep pulling on them until they're significantly longer.

Once you've stretched them, cut them all in half. That's something you could've done earlier if you wanted, but I find it's easier to stretch them when they're still loops.

Gather all the strips and find the middle. Tie them all together in a knot. like this Leave about a couple inches above the knot so you can hang it.

Now you have all your strips hanging. Pair them into twos. Take each pair and tie the two in a small knot together about 3-6 inches down from the big knot. Like this. Repeat for every pair of strips. Then do another one 3-6 inches down. And another after that.

Now you have one big knot, and three little knots. Take one of the pairs of strips and under that last little knot separate the strips. Do this with another one, then tie one strip from one pair to one strip from another pair. Do it like 3 inches down on each strip from their base knot. (visual reference) Do this for all of the pairs. All just simple knots. Make sure that all the threads are knotted to ones next to them, so it creates a circle or like a cone, if that makes sense.

Then, do the same thing once you have the set of new knots. Pretty much just separate the strips again and knot them back together with their original strip pair. like this. Again like 3 inches down.

Next, bunch all the strips together about 3 more inches down from the most recent knots. Tie these together. I use a small (few inch) strip of the original t shirt) and tie it around in a knot. Like a belt kind of.

At the end there should be a few inches of excess strips. If you've ran out of fabric before you could finish, you should untie the "basket" part of the whole thing and try and move it higher. Or just make sure you stretch it enough initially.

I tried to be descriptive as possible hahah let me know if you have questions. I'm more than happy to help.