A jersey is knit with one set of needles, where an interlock is knit with two. The interlock can be thought of as 2 1X1 ribs knitted at the same time and knit together.
The interlock fabric has the same face on both sides, is thicker, and won't curl as much as a jersey. It will skew less after you wash and dry the shirt, so it will "keep it's shape" better than a jersey.
Interlock is more expensive and the main factor to think about when you decide which to use is not the fiber content, but what garments you want. If you want a thicker, more stable garment and aren't concerned with paying more, then go with the interlock. If you need or can only afford the thinner fabric and don't care about curl, go with the jersey.
Can anyone tell me the differences between single jersey and interlock fabrics?
moreover,do i have to consider the two above-mentioned terms when i am planning to buy polyester-cotton blended fabric or poly-cotton-rayon fabric or 100% cotton fabric?