Cut-Make-Trim Capacity Planning for Seasonal Activewear Launches

Capacity planning for activewear usually goes wrong in the same place: the buyer books the sewing line and assumes everything else follows. It does not. A medium impact bra with a racerback convergence, a back cut-out and a three-row closure carries 30 to 50 separate operations, and the line is only as fast as its slowest supplied component. The constraint is almost never sewing labour. It is hook tape, elastic, or a moulded pad that was ordered three weeks too late.

What CMT Capacity Actually Means

Cut-make-trim capacity is a function of operators, working minutes, efficiency and the standard minute value of the garment, usually abbreviated SMV. SMV is the engineered time to assemble one piece. For a cut-and-sew medium impact bra with cut-out panelling, a removable pad pocket and a hook closure, SMV commonly lands between 12 and 18 minutes, compared with 4 to 8 minutes for a basic vest.

Calculating Your Line Requirement

The arithmetic is straightforward. A line of 40 operators working 480 minutes a day at 85 percent efficiency delivers roughly 16,320 productive minutes. At an SMV of 15 minutes, that is about 1,080 pieces per day. At an SMV of 18 minutes, it drops to about 900.

Apply this to your order: 9,000 pieces at 1,000 per day is nine production days, plus cutting, finishing and packing. Add 10 to 15 days for inline and final inspection with rework allowance, because inspection finding defects does not shorten the schedule, it lengthens it.

Booking Windows

Activewear capacity is seasonal. Spring and summer programs are typically cut from November to February, and autumn and winter programs from May to August. Book 60 to 90 days ahead of your required production start, and further ahead if you need a dedicated line. Book earlier still around Chinese New Year, when effective capacity disappears for two to four weeks and freight capacity tightens before and after.

Trim Is Usually the Bottleneck

Fabric gets the attention and trims cause the delays. Typical booking requirements: underband elastic 20 to 35 days, hook-and-eye tape 25 to 40 days, custom moulded pads 30 to 45 days including tooling, and printed or woven labels 15 to 25 days. Heat transfer labels are faster, usually 10 to 15 days, which is one reason they suit short runs.

Book trims against the confirmed bill of materials, not the estimate. A late decision to change hook gauge from two to three rows can add 40 days.

Buffer Planning

Build buffer where it is cheap. Ten days of schedule buffer costs nothing except planning discipline; ten days of air freight on 5,000 units can cost more than the entire trim package. Decide in advance which buffer you are buying.

Also plan the split. If your launch needs 3,000 units in store and 6,000 in total, agree a partial shipment schedule in the contract rather than discovering after cutting that the line can only deliver in one drop.

What to Put in Writing

Confirm production slot dates, daily output commitment, trim booking dates with responsible party, inspection windows, and an agreed remedy for late delivery. A capacity booking without dates and a remedy is a statement of intent, not a plan.