'Pada' should be used instead of 'di' when referring to a day/date. Furthermore, 'baju' can also be used instead of 'kemeja'.
we wear pink on wednesday
There are some sentences use "di hari" instead of "pada hari".
I think "pada" is formally more suitable when refer to date/day/time.
the word 'di' not necessary
its strange why you need the di.
in other exercises you don't need the 'hari' before the day - but in this exercise you are marked wrong for not using hari - this is inconsistent
Why as example " tiap " and when i use it it is wrong?