Kaç beden gidiyordun sen?
What size do you wear?


Am I right?

If it was

                      Kaç beden giyiyorsun sen?

then you are right.

Ok, my turkish friend wrote it to me in that way.. so I guess that´s what he meant then. Thanks

Both can be used but let me tell the difference:

Kaç beden giyiyordun sen? I fotgot your size (or pretend to forget), can you remind me...

Gramatically "şimdiki zamanın hikayesi"

Kaç beden giyiyorsun sen? İ never knew your size, can you tell me...

Gramatically just "şimdiki zaman"