Most people treat the cover as the decorative layer. It isn't. It's the precision layer. Everything that came before — the frame, the webbing, the foam, the batting — exists to support the cover being pulled tight, square, and consistent. When the cover goes wrong, the whole piece looks wrong. The cover is last. It is not an afterthought.
Fabric has grain. It has pattern repeat. It has directionality. Ignore any of these in the cutting stage and you cannot fix them in the installation stage. You cannot tug a piece into alignment after it's tacked. You cannot make a miscut pattern repeat match at the seam. Once the fabric is cut wrong, the piece is wrong. Measurement and marking happen completely before the scissors come out.
Pattern matching starts with a single decision: where does the dominant motif fall on the visible face? On an armchair, that's usually the seat back cushion, centered. Then the seat front and deck, running the repeat consistently across. Every other piece cuts to match that decision. The cuts don't create the match. The plan does.
Grain matters on plain fabric too. Upholstery fabric has warp and weft. Warp runs lengthwise down the roll. On seat cushions and backs, warp runs vertically — aligned with how the piece would hang. Cut a seat cover with warp running across because the layout was easier and it'll stretch unevenly under use. In six months it looks tired. Nobody can tell you why.
Mark on the wrong side with tailor's chalk. Cut lines, notches, alignment marks — all of it marked before scissors touch. Seam allowances run about 1/4 inch. Tighter than that and the seam won't ease around curves. Looser and you're chasing fabric forever. A quarter inch is the spec, not a suggestion.
Welting is where the eye goes. When it's right, the cushion edge reads as crisp and finished. When it's off — twisted a centimeter, stretched at the corner, inconsistent in profile — it's the first thing a client notices, even if everything else is correct. Welt on a curve must be bias-cut. Straight-cut welt on a curve fights the corner and loses. The cord inside determines the profile. The bias cut determines whether the welt actually turns. Both decisions happen before you start cutting strips.
Cold shop note for BC Interior winters: below 15°C, woven fabric loses elasticity. It won't stretch evenly over corners and gives false feedback when you pull it to the tack — feels tight when it isn't. Heavy textiles especially. Leather will crack. Bring fabric inside to room temperature before you cut, and before you install. This is not optional in November.
Lay the cut piece over the foundation dry before the first staple. Check grain alignment. Check pattern placement. Check seam location. Two minutes. A problem found at this stage costs nothing. A problem found after costs the piece and the yard of fabric you no longer have.
The fit is the last precision step in the arc. Everything from here is delivery.