My experience of this comes from keeping mice for many years and mice climb and use fabric better as they are very good climbers. However, I have witnessed mice getting a claw caught in the tiny threads when climbing out of a hanging hammock and it`s leg was suspended as a result. Luckily, this happened while I was watching, so from then on, I never suspended fleece or anything made from material from the cage. I did allow fleece and cotton covered cubes called `Homer Cubes` here in the UK made by a company called Fuzzbutt.co.uk , who mainly make home comforts for rats/chinchillas/degus etc, but also make smaller items for smaller rodents aswell.
So I guess I`m basing my concerns on that same basis and the fact that hamsters have pouches and are not as good climbers as mice are, I just presumed that leaving materialistic accessories in their cage might be harmful, but you guys seem to say otherwise. I just wouldn`t want to risk it personally.
hannah, fleece folded over and stitched up both sides (to make a `pocket` shape with one open end is a good way of making a quick `pocket pouch`! Just cut a piece of fleece in a funky colour about 18" inches long x 6" inches wide. Fold it over longways and stitch up each side with a sewing machine (or by hand) and the open end can be folded over at the edges aswell. When folded over and stitched up, the size should be roughly 9" inches long x 5" inches wide. Depends how small or how big you need it really. This size is fine for a chinese or dwarf hamster.
Felt can be more fibrous, so I would go with fleece. Felt is better to make felt creations from.