I'd steer clear of expensive flight gear, as it is definitely going to get dirty during the post-flight clean up. I use an old RAF flying suit - zip pockets, sleeve pen holders and calf map pockets are essential as it's your only in-flight storage in the Chippy, and you can't pick up anything you drop (worse still, dropped items could end up somewhere you really don't want them). Gloves are definitely useful - apart from keeping clean, and grip, there are opportunities for snagging your hands on bits of locking wire, etc around the cockpit.
ACL