This is the 15742nd most frequent Russian word.
пришлась
"Пришлась" means "came to" or "turned out to be necessary" depending on context.
Here, 'пришлось' conveys that the dress suited or was appealing to the sister, showing an evaluative context.
Платье пришлось сестре по вкусу.
The dress was to my sister's liking.
In this usage, 'пришлось' means 'had to' or 'was obliged to,' describing necessity.
Мне пришлось работать всю ночь.
I had to work all night.
Here, 'пришлось на' indicates coincidence or timing, expressing that the holiday occurred on a specific day.