I've been experimenting lately with different styles of Levi's and have been fairly disappointed in the flimsy material that they're using now.  The 517 and 514 styles have left me disappointed and feeling the need to go back to 505.  However, since I've begun buying the twills I have new faith.  These are soft and comfortable, and the fit is perfect for my trim figure.  They are not too tight, not too loose and look great with a dressier shirt or a t-shirt.  I wear these as "business casual" at the office with a nicely ironed button-up shirt and they look great.  I have a pair in every color and highly recommend them.