Wingsuit progression checklist

Taking canopy downsizing as an example, there has been quite helpful list of drills and exercises a pilot should feel confident to perform before considering switching to smaller size.

Likewise, it would be nice to have the same for switching to a bigger wingsuit. For example, I wish I learned to fly whole jump with arm-wings collapsed and palms touching BOC before switching to a bigger suit.

What other drills would you recommend for self-evaluation?

Good questions to ask yourself before upsizing would be: 

Am I achieving laminar airflow, or just plowing air like a student?

Am I having consistent on heading openings? 

Can I fly my suit at all angles of attack? No need to get a big suit if you can't go steep. 

Am I willing to accept the risk that my AAD may not activate if I need it due to low air speed?

If you can say yes to all 4, you're probably good to go.

I would definitely add transitions, backflying and upset recovery to that list.

Yes to all the above. And less a drill, but more - make sure you are achieving the maximum performance of the suit. Many go to a big suit for more performance but in actual fact could just fly a bit better in their current suit.