Are there any circumstances in which one should wash dress shirts, pants, chinos, or sweaters in a machine with warm wash setting. I ask because I have some BB all cotton dress shirts which say wash in warm water. Normally, I disregard such 'labels' and wash in cold water.
Anything that can be washed in warm water will be safe to wash in cold, though the warmer the water, the better it generally is at removing stains. The standard advice is to wash things with water as hot as you can use safely with everything in the load. Though there are some detergents these days being made specifically to work better in cold water, so you may be able to get the best of both worlds.