Business casual attire for new business?

Hi. My mother (55 years old) and her friend (38 y.o) will start a new business where they will give computing clasess in the houses of their clients (students).
I have suggested them that they would need a pretty business casual attire because using different kinds of street clothes everyday will give a bad image for them and their business.
Because of they will work more than 6 hours per day, and they need to move and travel too much, I also suggest them that they should include tights or leggings as part of their uniform, because they are practical, fashionable, youngful, confortable, fresh, besides it is a original idea.
But I don't know how they could combine them with other clothes so that they have a good presentation with their clients. Please send me photos of fashion ideas.

thank you
 
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