George, that's an interesting story! Thank you for sharing:)
Ryan, When it comes to just a furoshiki cloth by itself, there are some standard sizes like 50cm x 50cm, 70cmx70cm, 90cmx90cm, 100cmx100cm, 130cmx130cm. There are so many colors/patterns/materials but maybe, if it's a traditional one, they might choose a specific color and pattern depending on the occasion.