I have seriously flat feet and cannot wear flat shoes without my orthotics or end up with serious ankle, knee and foot pain by the end of the day.  I recently injured my knee so could only wear flat shoes at work.  I bought 3 different types in case any were no good and needed to be returned but I needed to wear them immediately.  Luckily all of them are comfortable but these by far are the best.  I'm normally an 8.5 to 9 and bought these in an 8.5.  The fit is comfortable although a little loser than I would've liked but can fix it with a ankle/heel grip things for the back of the shoe.  I don't know if the 8's would be perfect or too small.  Regardless I am very happy with these shoes.  They were comfortable right out of the box and they look good for the office too.