I ordered E34 in 2017 and now wear F40. Love the product.
My respectful suggestion is not to order too large and err, if at all, on the smaller size. The fabric will stretch and you really don’t want it to merely be a coat. You want it to fit snug enough to prevent turtling. All of us want a bigger one but ordering a larger size than you need will not help get you there.
I wear it overnight and it is great. Unless your retainer is too tight or you have too many lawyers on it should be comfortable.
I have purchased 3 sets of Innerwear and 1 corkscrew. I outgrew my first one so I upsized. Then I added a 2nd one to use after I pump. I am very pleased with these products. Also, they do stretch as any fabric will do over time so I suggest the sleeve be replaced every 3-6 months depending upon usage.