Plus-Size Menstrual Pants

Sizing & grading

Standard disposable menstrual pants often stop at a hip measurement that excludes a significant share of consumers. Plus-size lines typically extend to 140–160 cm hip circumference. Buyers should specify:

• The full size curve you need, with minimum and maximum hip measurements for each size
• Whether you want a continuous curve or discrete sizes (S, M, L, XL, 2XL, 3XL)
• The grade rules between sizes — how much the waist, hip and core dimensions increase per size step

Chassis engineering

Simply scaling up a standard chassis does not work. Problems and solutions:

• Core displacement. On a larger chassis, the core can shift forward or backward during wear. A wider adhesive anchor zone or a sewn core pocket keeps it centred.
• Leg-cuff gap. Thigh circumference increases non-linearly with hip size. The leg opening must be graded independently, with adjustable tension if possible.
• Waistband roll. A narrow elastic band rolls on larger waists. A wider, softer waistband with distributed elastic points reduces rolling and red marking.

Elastic & fit

Elastic performance is critical in plus sizes:

• Waist elastic. Use a wider spandex ribbon (20–30 mm) with lower linear density so the pressure is distributed over a larger area.
• Leg elastic. Dual strands at different tensions — higher at the front for secure fit, lower at the rear for comfort when sitting.
• Stretch recovery. The elastic must return to shape after extended wear. Test recovery after 8 hours of simulated tension.

What to specify

• Full size curve with hip, waist and thigh measurements
• Chassis grading rules
• Core anchoring method
• Waistband width, material and elastic specification
• Leg-cuff design and tension by position
• Fit-test protocol on your target demographic

Where plus-size products fail in use

• Waistband roll-down. A narrow elastic rolls under a larger abdomen. Ask for elastic width and the adhesive pattern that holds it flat.
• Leg gap at the inner thigh. Scaling a standard pattern up leaves a gap that no amount of absorbency fixes. Ask whether the largest sizes have their own die.
• Core in the wrong place. A wider chassis carrying a standard-width core puts absorbency off-centre. Ask for core width per size.
• Backsheet tearing at the seam. Larger panels carry more tension. Ask for seam strength and film tensile figures.

Writing the RFQ line

Plus size is a grading question before it is an absorbency question. State:

• The top of the size curve, with waist and hip ranges for each size
• Whether the largest sizes use their own cutting die or a scaled standard
• Core width and length per size
• Elastic width, type and tension
• Seam strength and film tensile requirements
• Pack count, which usually falls as size rises

Running a fit trial

Plus-size programmes fail on fit far more often than on absorbency, and fit cannot be assessed on a mannequin. Structure the trial before the first sample arrives:

• Recruit by measurement, not by dress size. Waist, hip and thigh circumference are the variables that decide whether a cuff seals. Dress size varies too much between markets to be a specification.
• Cover at least three body shapes per size. A size that fits one tester proves nothing. Five testers per size, spread across shapes, is the minimum that produces a usable signal.
• Record where it fails, not that it failed. Front, rear or side; a red mark from elastic; the product sliding down; the cuff rolling. The pattern tells you which dimension to change.
• Run two rounds. The first round identifies the problem, the second confirms the fix. A single round measures your first guess, not the product.

Watch the step between sizes. Where the waist jumps by more than about eight centimetres, users end up between sizes: they buy up, the product gaps at the leg, and the leak is recorded as an absorbency complaint. Grading increments matter more than the outermost size in the range.