Top Down Center Out (or “TDCO”) is a fitting method created by Ruth Collins. Unlike conventional methods for fitting trousers, TDCO doesn’t require the maker to identify problematic body parts or perform traditional body part adjustments. Instead, TDCO relies on a few key variables to fit any pattern to any body. To read Ruth’s step-by-step instructions, see Threads Magazine (Summer 2022 Issue 218), or head to my YouTube channel to watch my TDCO video series.