Is it ok to wear yoga pants all the time?

When is wearing yoga pants or work out clothes unacceptable?

Obviously to fancy or dressy occasions it is a no no. Like a wedding, definite no no. When it comes to day in and day out is it ok?

When I go to my daughters preschool I feel like it is the uniform of the moms.  I do it a lot, guilty as charged.

Have yoga pants taken the place of jeans in our common everyday wardrobe?  When I am wearing jeans these days I feel like I’m dressed up. haha

So is this weird?  Do you ladies do this too?  Thoughts?