I'd think burlap or muslin would degrade too quickly to be practical. Remember you have soil and water to contend with. they will rot the cloth before the summer is even half way over with.
I'd think a better option would be chicken wire with newspaper used to hold the soil in till the roots and plants matured enough to hold the soil in place.

Chicken wire with coir cloth would also work. Coir is coco fiber made from sustainable coconut husk fiber. The baskets you see in garden centers with the brown lining - that brown stuff is usually coir fiber.

DL

5 gallon bucket painted to desired color (or not) with holes drilled in the sides where wanted. You need a large drill hole bit, but I have seen this done for the upside down tomato hangers. I think I am going to try it with strawberry plants.

don't know if this is the kind of thing you're needing, but the "silver bullet" bags at Starbucks are wonderful for temporary flower pots.

Just poke drainage holes in the bottom.