Since this is a Dimensions kit, I would try contacting the company first and see if they can get you the floss. That would give you the best color match.

Hello,

You will need to contact the manufacturer of this kit for more supplies. We are just an online retailer of Dimensions kits and not the ones who put them together so we do not have any of the supplies that they use for their products :( Here is their contact information, so just contact them and let them know what product you have theirs and what items are needing and they will get it taken care of for you :)

https://www.simplicity.com/contactus
Monday to Friday
8:00 AM to 4:30 PM CT
1-(800)-794-5866

~Kristi @ ECS