The "Doeskin" line by Hainsworth is the most perfect match I have seen to the original weight of wool using in antique cases. Have used it several times, and have never been disappointed.

Many people use wool that is too heavy, and the finished case partitions look bulky. If you are doing a French fitting, it doesn't really matter.

“I left long before daylight, alone but not lonely.”~Gordon Macquarrie