Missing pattern attribute (apparel)

Apparel feeds with pattern (striped, floral, plaid, solid) get better visibility for pattern-specific searches. Without it, listings are de-prioritized for those queries.

Pattern is rarely in standard product feeds; it requires specific tagging when products are uploaded.

1. For each apparel SKU, identify the dominant pattern: solid, striped, plaid, floral, geometric, etc.
2. Populate pattern in the feed.
3. For solid-color products, 'solid' is the right value (not blank).

• Leaving pattern blank for solid-colored items