As mentioned in another post, I'm a newbie who's recently lost 30 lbs and has to buy a whole new wardrobe. Like the title asks, how do I know if a dress shirt fits right? Like, how do I know if the collar isn't too tight/loose? Etc.? I recently bought a Claiborne "Modern Fit" shirt in Medium. Seems OK but I want to be sure before I wash/wear it. Oh, and if you can recommend some good off-the-rack brands that sell fitted dress shirts (ones geared more toward nights out rather than work days) that would be great too. I'm willing to spend up to $150 per shirt. Thanks in advance for all your help, guys. You're really helping my transition to becoming a new man.