Yarn is a spine composition of either natural or Man Made Fiber or filaments and is used in weaving of different kinds of Suiting Fabric/Cloth.
Polyester is a refine petrochemical Man Made Fiber. It used separately or mixture with other fiber (like viscose, cotton, wool) to make various kind of yarn. This yarn is used in various Suiting Fabric Qualities e.g. Gabadine, Tusser.
Viscose is natural fiber made from specific wood cellulose (e.g. bamboo) used in various kind of yarn.
PV (Poly Viscose) is a type of yarn which is a combination of polyester and viscose fiber used in different ratio.
Blend is a ratio of different types of fiber used for spinning yarn. For example 65/35 PV, that means 65% polyester and 35% viscose fiber used for making this blend. 2/15, 2/20, 2/30, 2/40, 2/50 Yarn means 2 threads of respective count yarn (15, 20, 30, 40, 50) twisted.
Count is measurement that defines the thickness of yarn. As count increase yarn become thin. For example 30 count yarn is thin than 20 count.
PD (Piece Dyed) means the fabric made from grey yarn and dyed in process house in different shades. FD (Fiber Dyed) means fabric made from dyed yarn of different color.
Jacquard is not a fabric quality; it is a technique used in pattern of Selvage in Suiting Fabric.