Draw the basic garment shape first
Sketch the area where the ruffle will attach
Add a wavy outer edge
Add a slightly curved inner edge
Keep the waves uneven and natural
Draw folds radiating from the attachment point
Make some folds overlap
Vary the fold sizes
Add deeper curves where the fabric bunches
Use light lines for the initial sketch
Refine the ruffle outline
Erase unnecessary construction lines
Add shading under each fold
Darken areas where fabric overlaps
Add highlights on raised folds
Repeat the wave pattern along the full edge