A single apparel product becomes a SKU matrix. A hoodie at 5 colors and 12 sizes is 60 SKUs. Add a wash variant and you are at 120. Run a limited drop with seasonal colorways and you are at 200 SKUs for what looks like "one product" on the storefront. Slotting, putaway by velocity, and pick-path geometry decide whether ops cost-per-order stays low or climbs because picks walk further than they should.
Returns rate in apparel runs 25 to 40% across the category, and the way the 3PL processes returns IS the margin lever. A unit returned in 7 days, refurbished, and back on the saleable shelf in a few days sells at full price into the next cohort. A unit that sits in a return queue for weeks, gets default-destroyed, and lands in landfill is a near-total loss against a 60% gross margin garment. A refurb-vs-destroy decision tree per SKU class is the standard, not a default-destroy queue.
Channel mix in apparel is the most retail-exposed of any DTC vertical. Shopify owns the brand-control lane, Amazon is the volume lane on basics, and retail wholesale (Nordstrom, Saks, Anthropologie, Revolve) is the credibility lane and the seasonal-buy revenue lane. EDI 850 inbound, EDI 856 ASN, UCC-128 case labels, hangers vs polybag pack spec, and routing-guide chargebacks are the wholesale ops reality. The 3PL has to flip between DTC, FBA prep, and retail compliance in the same shift without crossing the labels.