I used Lion Brand 24/7 100% Mercerized Cotton yarn in Aqua and Lion Brand 100% Pure Cotton yarn on this project.
Both are the same pattern
Both are cotton yarns
Both yarns are rated as #4 weight
But, there is a difference. The 24/7 yarn is much lighter and feels so soft. The 100% Pure Cotton is MUCH heavier and doesn't drape as nice as the 24/7, but the look of the stitches appeals to me more.
Easy Beach Coverup Pattern includes Small to 6X sizing
Link to pattern: http://www.craftsy.com/pattern/crocheting/clothing/easy-beach-coverup-small-to-6x-1505/190305
My results with measuring the Wraps per Inch
Lion Brand 24/7 I got 16 WPI
Lion Brand Cotton I got 12 WPI
I love BOTH yarns and will miss their old cotton. I have used it for many things and for many years.
BUT, I am Very Pleased with the new 24/7 yarns and the colors that are available. This yarn gave the garment lots of luster and the drape is fantastic.
Here's the information from Lion Brands Site http://www.lionbrand.com/cgi-bin/yarnInfo.cgi?yarnPageIndex=1
Lion® Cotton YarnArticle # 760
DISCONTINUED: This yarn is no longer available; however, we make this information available as a courtesy to those who still have the yarn.
Our classic 100% cotton, 4-ply worsted-weight yarn with great absorbency. Ideal for dishcloths, washcloths, placemats, and all kitchen/dining/ bath projects, as well as accessories and garments.
24/7 Cotton YarnArticle # 761
24/7 Cotton is a worsted-weight, mercerized 100% natural fiber yarn. The mercerization process gives the yarn incredible color and sheen which will last through multiple wash cycles. Choose from a variety of 24 colors, which will be perfect for making fashion garments, home décor, bath and kitchen accessories, and items for babies and children.