I have a list of savings, expressed in terms of the items that necessitate the original costs. For example, say that I have to purchase sewing material. My first question is: in expressing the amount of money required to obtain this material over the course of a year, should I say *Sewing Material Cost* or *Sewing Material Costs*?

In the act of purchasing material, there is a set *cost* per unit of product. However, when discussing the cumulative money spent on material in a year — the sum of multiple purchases — do you use the plural?

Now, I want to express the amount of money saved in my material purchasing expenses. I would say *Savings of Material Costs* (savings of material cost doesn't seem to make sense to me), which ultimately becomes *Material Costs Savings*. This, for some reason, seems weird to me.

Something resembling *material costs savings* is where I want to end up, but I'm not sure if my grammatical composition is correct.