How about maternity yoga pants  the demand for maternity yoga pants is  almost nothing compared to regular yoga  pants but 3,600 people is still  significant and I can capture even 1% of  those 3,600 people that's more than a sale  a day - not bad for a new business.

Finding niche products isn't easy, if it were  everyone would do it so take your time  and use tools like kW finder and Google  Trends to help you do the research, you'll find tons of free tutorials on  using these tools.