[Re] Which size n model?
Based on your measurement you should be in between L and XL. However for maximum control L would be better. Refer to the attached size chart.
As for model, both camisole and tank top have the same benefits but tank top is good also for those who wants to control the flabs bear the underarm area at the back.
For easy wearing, wear stockings, tights or leggings first then wear the camisole or tank top.