AKC Chinese Crested breeder here. Pierre only needs a shirt when it's cold. A good rule of thumb is if YOU are cold, he will be, too.
The bumps you describe are most likely pimples. Just like humans, Cresties can get acne. Sometimes it′s hormones or a reaction to clothing / chemicals in the house, sometimes it's genetic (bad genes lead to major acne problems later in life!)
Almost all acne goes away on its own, but you can help by bathing Pierre 1-3 times a week, using a GENTLE salt scrub meant for humans, & tear-free baby shampoo. If his skin seems dry, can use an oil-free lotion for babies.
I must disagree 100% regarding consumption of bread. While some dogs will have an adverse reaction to certain foods, there is NO definitive scientific proof all Chinese Crested have a sensitivity to bread. In fact, when dogs are ill, many vets serve bland foods (plain bread, rice, or bananas.) Before removing or adding anything to your pup's diet, consult a veterinarian!
Answered by almostnakedpups - 10/11/2010 6:02:01 PM