This is the 5265th most frequent Russian word.
обычной
"Обычной" means "ordinary" or "usual."
The word 'обычный' is used here to describe the normal, usual nature of the day, indicating that nothing extraordinary happened.
У меня сегодня был обычный день.
Today, I had a regular day.
In this sentence, 'обычную' describes the clothes as standard or typical, as opposed to formal or extraordinary attire.
Она носит обычную одежду на работу.
She wears regular clothes to work.
Here, 'обычное' identifies the decision as the most common or expected one, considering the circumstances.