Something that refers to a collection of folded up cloth you'd buy at a store. An official term? I'm blanking.
a length or roll of cloth or wallpaper
A bolt is a unit of measurement used as an industry standard for a variety of materials from wood to canvas, typically materials stored in a roll. Length will vary according to the type of material measured.1 The length is usually either 40 or 100 yards, but varies depending on the fabric being referred to.
The usage of bolt referring to cloth is very old, it dates back to the 15th century:
Applied since Middle English to other short metal rods (especially those with knobbed ends). A bolt of canvas (c. 1400) was so called for its shape.
I suspect you're referring to a bundle of different cloths that are sold for quilting. If so, then you're usually talking about fat quarters (18x22 inches) or cake layers (9" squares). There are even smaller charm squares (about 5") which are sold in bundles, but these are not always folded.
even possibly a remnant
cloth left after the rest has been sold or used
Swatch (noun), from Google:
a small sample of fabric intended to demonstrate the look of a larger piece.
- a collection of fabric samples, especially in the form of a book.
I suggest this because of your use of the word "collection" in your question.
bolt is the common name for the standard unit of cloth, it typically only holds a single color/pattern. If you are looking for the collection of patterns/fabrics for sampling purposes,
swatch might fit best.
2 : a great amount —usually used in plural
Although typically used to described paper, one could say:
I am going to buy a ream of cloth.
The store has many reams of cloth to choose from.