What to look for in Riding Suits?
For the wicking action to work you need to wear something that is relatively taut on the skin. Any common jersey should do the job. I and others have had success with light weight wool jerseys like from ibex. 

Generally speaking, cotton is not a good choice for the base layer next to your skin. It will work for a while but as soon as it gets drenched with sweat you'll be miserable. 

Layering is key for colder weather. First knee and arm warmers, then a cap under helmet, and shoe covers, then a lightweight jacket or winter training jersey. After that, a "dicky" for your neck and tights over the bibs