Cutting the wrong size line

Pattern pieces that hang crookedly or twist once sewn were likely cut without aligning the grainline to the fabric's lengthwise threads. Measure the grainline arrow from the selvedge at both ends before pinning down.

Pattern pieces ending up slightly distorted despite careful layout often come from fabric sliding under the pattern weights or shears as you cut. Use a rotary cutter with a mat, or weight the pattern heavily.

A piece cut with its markings or nap direction inverted usually happens when the pattern was flipped without checking the layout diagram. Always follow the diagram exactly and keep directional details facing one way.

A finished garment coming out drastically too big or small, even with correct sizing chosen, usually means a home-printed PDF pattern was printed without disabling page scaling. Always print and measure the test square first.

A garment that doesn't fit despite following the pattern comes from choosing a size by ready-to-wear labels rather than the pattern's own body measurements. Measure yourself and compare directly to the finished measurement chart.