PBM jacket pattern generator

Measurements (inches)

Units: inches cm

Dog name — printed on the pattern

A · neck girth collar line

B · shoulder girth behind front legs

C · chest girth widest rib, midway B–D

D · lumbar girth natural waist

E · hip girth widest hips

F · topline length neck base → tail base

Coat: smooth thick

Advanced (seam, LEDs)

Seam allowance (in)

Ease override blank = auto

LED spacing (in)

LED strip width (in)

Rear coverage % of back · how far the light reaches toward the tail

Solid = cut line · dashed = sew line · dash-dot = spine · blue dashed = LED channel · red dots = LED positions · green circles = zone centres B–E · brown = strap tabs.

Construction notes — how the light stays on the spine

LED channel: stitch both blue lines into a sleeve down the spine centreline; leave the neck end open so the strip slides in (and out, to wash/charge). The strip is captured, not floating in a pocket — that's what keeps it on the spine.
Inner contact layer: mount the strip on the skin-side layer with thin foam or 3D-spacer mesh behind it so it presses through the fur. Position without contact pressure is wasted dose.
Strap tabs: attach the chest and lumbar straps at the brown marks. Cinched evenly, the symmetric panel self-centres on the topline ridge and the straps stop fore-aft slip and rotation.
Flexible strip, not a rigid pad: the channel follows the spine's curve — use a bendable strip so it conforms along the whole back instead of tenting over the arch.