The Things People Wear...

We've got some interesting outfits today. There's a lady in nice shoes and slacks with a Tweety-bird scrubs shirt. The man next to me has a seriously bad 90s sweater on, knitted and brown. The gal across from me is wearing a neon pink tracksuit. On comes a lady in a brown hat with a wide brim and a mustard-yellow hoodie. What occasion is she dressed for?