When do the sales start in Milan, would it be ok if I went on 1st July 2007 or would it start the next week?

Answer 1

As already answered here above, official summer sales shall start in Milan on July 7th, 2007.
But.....but....but... a few shops (not all however...!!) will be selling at a some discounted price already around end June/early July.
However, even if you can't postpone yr visit until 07/0, I guess
that, provided you keep yr eyes open, you'll have all the same a few good opportunities to buy somewhere cheaper than in normal times

Answer 2

Summer sales start on the 7th of July.