Pants & Skirt Tools
Pants are the hardest garment to fit. Start with the size finder, adjust the waist, then check the rise. Use fit diagnosis after making a toile to troubleshoot drag lines and wrinkles. Also includes skirt tools — circle skirt calculator, hip-primary size finder, and pleat calculator.
Pants Size Finder
FreeFind your size across Big 4, Burda, Cashmerette, Closet Core, True Bias, and Seamwork. Sized by hip with waist adjustment note.
Waist-to-Hip Adjuster
FreeAfter sizing by hip, calculate how much to take in (or let out) at the waist and how to distribute it across side seams and darts.
Crotch Depth / Rise Calculator
FreeCalculate your front and back rise adjustments from a sitting measurement. Accounts for belly and buttocks shape.
Pants Fit Diagnosis
FreeSelect the drag lines and fit issues you see on your toile — get a prioritized list of causes and fixes.
Crotch Curve Estimator
FreeGet a starting-point crotch curve profile and extension amounts based on your body shape. Always requires a toile to fine-tune.
Circle Skirt Calculator
FreeFull, 3/4, half, or quarter circle — inner/outer radius, fabric yardage, and cutting instructions.
Skirt Fitting Tools
FreeHip-primary size finder and waist adjuster — for skirts, your hip measurement comes first.
Pleat Calculator
FreeKnife, box, or inverted pleats — total fabric width, per-pleat breakdown, folding steps.
Recommended order
1. Pants Size Finder — find your starting size by hip measurement
2. Waist Adjuster — pants almost always need waist adjustment
3. Rise Calculator — check if the crotch depth is right for your torso
4. Make a toile — sew a quick test garment in cheap fabric
5. Fit Diagnosis — identify drag lines on the toile and get fixes
Why pants fitting is hard
Every other garment — blouses, skirts, jackets — fits by circumference measurements: bust, waist, hip. Pants require all of those plus the crotch curve, which is shaped by geometry no tape measure can capture: the angle of the pubic bone, the prominence and position of the seat, the depth of the perineum.
No software, including these tools, can tell you your exact crotch curve from measurements. Professional tailors rely on a muslin fitting iteration — they make a test garment, look at the drag lines, and adjust. These tools help you start from the right place and teach you to read what you see.
The good news: once you have a well-fitting pants block for your body, you have it forever. Every future pair of trousers starts from that block.