Which preposition should I choose in this case and why:
e.g. This is what I wore to work/at work yesterday.
But I don't get why 'to' is correct.Could you give me a further explanation,please?
I wore this when I went to work.
That one is fairly straightforward. In general, however, there is little point in asking why we use certain prepositions in certain phrases. Prepositions are a law unto themselves - in most languages that have them. We watch things on television, the French watch things at the television, and Germans watch things in the television. That's just the way it is.