Passport breaks down luxury goods as an industry. Select "Luxury and Fashion" from the "Industries" tab -- refine/limit search by category, geography, or type of content (reports, charts, articles).
Statista offers a range of Dossiers on the Global Luxury Goods Industry Worldwide as well as many reports on specific product segments.
Luxury Goods. FT This website houses all Financial Times news, analysis and special features related to the luxury industry, broadly defined.
The Wealth Report by Knight Frank describes the state of the luxury real estate market.