Google: use it twice:
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Read background, understand basics -- All the while gathering words and terms I can take elsewhere to keep looking.
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Come back for ideas, vendors, data, orgs, more.
EX:
1. For "What do little people want in clothing" Google brings you:
Now you know there are some businesses that are already catering to this market, discover some expressed problems, and hopefully find a niche youcan fill. Compare this info with the demographics and psychographics you uncover to determine if your product will have a market.
Watch what words are being used, and by whom. What dos that population call themselves? Is there a medical term?
2. Now that I have the basics, and terms in use, I can search for specifics: Little People organizations or statistics.
OTOH, Googling "What do elderly fashionable women want?" didn't help me much. It was mostly ads for elastic-waisted polyester pants.... voila le probleme.
Critique whether websites know what they are talking about, or are they using stereotyped, misguided, or uninformed projections of bodies othered by the mainstream. Empathy and sensitivity are a must. Data, data, data will keep you from making big mistakes.