希望大家帮忙翻译下，谢谢了~~

3 percent shrinkage-quivalent to reducing the garment by about one size,altering fit
3%缩水率 - 相当于衣服缩小一个码。altering fit得推敲一下。

prewashed-less likely to shring when washed;with denim,this usually means a soft,faded look
水洗面料-清洗后不容易缩水。对于牛仔布面料，往往意味着柔软、有褐色效果的面料。

preshrunk-a meaningless term that is not helpful.It fails to tell how much more the product will shrink when washed again.
预缩加工（防缩加工）-毫无意义的一个概念，无实际用处。并未说明产品再次洗涤时还会缩水多少。