I’m so sorry about your loss, Pil. Losing a parent is very difficult in many ways.
I love the outfit you show with the floral top. As far as being able to wear it again—for my Mother’s funeral, I went out and bought a dress. I never could wear it again because the only association I had with the dress was her funeral.
For my Father’s funeral, I chose a dress and jacket which I’d already owned a few years and worn several times. I’ve been emotionally able to wear them again after the funeral.
Whatever you decide is the right decision for you and will honor your Mother’s memory.