RC01 runs on two body blocks — short-box for four SKUs (Always Tee, HP-1, HP-3, Heritage Patch) and racerback muscle-tank for the Summer Body Tank. Both blocks are ready-to-wear blanks (AS Colour 5080 + BC 3483); RC01 is not a custom-fabric program. That's deliberate. Proportion is the first signature (Code 5) — the block does the primary brand work before any print lands.
Blank: AS Colour 5080 · Heavy Faded Tee · 220 gsm combed ring-spun cotton
Heavier, shorter body than a standard cotton tee. Shoulder-drop controlled. Designed to sit at the hip, not past it. Holds its shape after five washes rather than softening away.
Fit note. Runs true to size. Size down for a cropped read at the hem. Size up for a looser architectural shoulder. Because the block is built shorter than most wearers expect, ignore your usual fit instinct if ambiguous.
Blank: Bella + Canvas 3483 · Unisex Jersey Muscle Tank · 4.2 oz ring-spun cotton
Extended armhole, racerback, muscle-tank cut. Runs true through the chest, cuts tighter through the waist than a standard unisex tank. Not gym-cut — runway-cut.
Fit note. Designed to sit alone in July and layer under a cotton shirt or unstructured jacket in May or September. The extended armhole shows shoulder architecture; the racerback collapses the back triangle into the mark.
Size chart · both blocks
Body measurements in inches and centimeters. Size runs vary slightly between AS Colour 5080 and BC 3483; these are averaged approximations pending production-sample confirmation at T-19 (all blanks in inventory).
| Size | Chest | Body Length | Shoulder Width |
|---|---|---|---|
| XS | 18" / 46 cm | 26" / 66 cm | 16" / 41 cm |
| S | 19" / 48 cm | 27" / 69 cm | 17" / 43 cm |
| M | 21" / 53 cm | 28" / 71 cm | 18" / 46 cm |
| L | 23" / 58 cm | 29" / 74 cm | 19" / 48 cm |
| XL | 25" / 64 cm | 30" / 76 cm | 20" / 51 cm |
| 2XL | 27" / 69 cm | 31" / 79 cm | 21" / 53 cm |
Per-SKU fit essence
One-line fit quote per SKU, derived from each PDP's Fit & Wear paragraph. Use these as the copy that lives inside the size-guide drawer on the final PDP.
| SKU-01 | Short-box block. Runs true. Size down for cropped hem, size up for architectural shoulder. The 220 gsm cotton holds the shape after five washes. |
| SKU-02 | Racerback muscle-tank block. True through the chest, tighter through the waist. Runway-cut, not gym-cut. The ê at the nape sits where the wearer cannot see it. |
| SKU-03 | Short-box block with full-chest HP-1 DTF. Print centered over the sternum; when the wearer turns sideways the mark reads as a single bar of typography, not a logo. |
| SKU-04 | Short-box block with scattered HP-3. The chest cluster pulls the eye inward, the back cluster extends the torso line upward. Reads as one thing close up, three things across a room. |
| SKU-05 | Short-box block. The patch is the piece's only mark — no chest wordmark, no back print, nothing at the nape except the shared woven label. In five years this is the shirt still reached for first. |
Provenance. Body-block descriptions derive from public/rc01-deliverables/pdp-copy/rc01-pdp-copy.md (per-SKU Fit & Wear paragraphs) and public/rc01-deliverables/production-playbook.md (QA rubrics). Size chart values are averaged approximations across AS Colour 5080 and BC 3483 published specifications; production samples received at T-19 will refine these to garment-specific figures. The short-box block's "sit at the hip, not past it" discipline is the single most important fit note for RC01 — the block is shorter than most wearers expect, which is the point.
QA tolerances. Shoulder drop ±1 cm, racerback angle ±5 mm, placement tolerances by SKU per production-playbook.md. Any sample out of tolerance triggers vendor re-work before the first production run ships. Samples that pass QA on a single garment but fail on a subsequent production run trigger a full batch review.