If you're producing attire for women, there could be a market niche for shorter women around 5 foot 5 and under. There are shorter women who have to re-hem and alter most of their clothing to fit their shorter frame which could translate to significant market demand.
Years ago there were "organically sustainable" fabrics made out of bamboo or hemp which were supposed to be more environmentally friendly. I don't know how accurate that description was but its a good bullet point people might like to see with higher average temperatures and current day heatwaves being significant issues.
Cosplay seems like its big right now. Maybe there is some way to address that. Social media advertising is free and makes it easier to connect with customers & expand ones business than ever before.
Also I wish people who wrote these types of posts would provide more information to show that they're serious. That would go a long way.