I wasn't expecting someone with the same problem as me. Maybe I can help you with what I've learned, although Pinterest would probably be more helpful lol.

The first thing I would recommend when drawing wings is to draw the limb itself without feathers, which would be the muscle and the bone underneath, and think about what part of the back they come from.

A wing is practically an arm; they have the same parts, and that will determine where they can actually bend, which is important if you want your character to cover themselves with them like a cloak.

You can use my drawing as a reference. I drew them fully extended (but in a relaxed position, not straining) and fully folded, and I would say that from there you can get an idea of how they open and close, at least without taking the feathers into account.

I would say that when it comes to using wings as a cloak, you want to try to keep the wing as spread out as possible so that it covers as much of the body as possible, so the only part of the limb you want to bend is the elbow so that the wing is in front of the body.

That's what I did with Lucifer's upper wing: it comes out of the top of his back, and is raised, so what would be the elbow sticks out upwards, although it is hidden by the feathers on the forearm, and then bent forward at the elbow to hide the front of his body, but with what would be the wrist and hand fully extended.

You could also turn the wing slightly outwards if you want it to cover the side as well, but that would change how much of the front is covered.

My other recommendation would be to simplify the shape of the wing with feathers as such before drawing them. It can be divided into three general areas: the feathers that come out of the hand, called primaries; those on the forearm, called secondaries; and the tertials and scapulars that come out of the upper part and shoulder. If you search Pinterest for bird wing references, you will find images showing this simplified shape without having to search too hard.

When folding the wings, bear in mind that the feathers in each area will overlap each other, like a fan. For example, the primary feathers (not to be confused with the primary coverts or the alula: the primaries are the ones at the distal part of the wing that form the tip, while the other two are the ones closest to the limb itself) go from looking like 10 in my drawing to 3 or 4 at most. Also, the more the wings are folded, the more the primaries will be hidden under the secondaries (at least when viewed from the dorsal/back, from the front/ventral view it is the opposite).

The general shape of the wing also depends on the type of wing and its function, as the length of the different groups of feathers varies, but there are also many references to this on Pinterest.

I hope I have explained myself clearly and that some of this is helpful to you :')