I use a mix of cycling specific and generic outdoor clothing. Cycling specific (or at least marketed and packaged as being for cyclists): long sleeve jerseys, windproof vest, day-glo jacket (for commuting), full fingered cycling gloves, shoe covers, fleece skull cap. Generic outdoor gear: black running tights, polypro base layers, merino wool hiking socks, lightweight fleece pullover.

I also try to wait and buy during sales whenever possible.