How much fabric does the longer version use?

I made a slouchy handbag. The fronts (see second photo) and back are made from the black linen beaded tunic and the piping and strap from the M&S top. Lining is from stash.

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It is this shape because it is made of the  pieces that were left after I had cut a short sleeve for my top out of the long sleeve of the tunic.

The front uses the V neck of the tunic, made into a pocket, which is big enough to hold a baby elephant:

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Or more sensibly a mask and hand sanitizer.  I have put a zipped pocket inside for credit cards, a pocket for a phone and a loop with a thingie to clip keys to. The bag itself has a magnetic clasp.

I am quite pleased with this.

I need to decide how to finish the neckline, which may mean changing the edging if the sleeves (currently using the original hem)

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I would look for a pattern that has also been designed as suitable for PU (vinyl) or cork. These materials are thicker than fabric and so some patterns may not be suitable. They also don’t need to be hemmed and turned in the same way and you can (but don’t have to) have raw edges

Indeed.  I've made a few small shoulder bags out of both fabric, and out of PVC.  The PVC ones are noticeably smaller than the fabric ones.  I'd make up a PVC version of your preferred pattern before cutting into your leather.

I've got my pattern pieces together and realise that I don't quite have enough fabric to do what I had intended to do.  I could probably find another black item to cut up; but really need to decide what kind of top this is to be; I could add black velvet and make it an evening top, or plain cotton and let it be more of a day-time outfit.

Decisions, decisions.

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I have this.  Bought some years ago from a charity shop for £3.99, with, I think the intention of making it a bit smaller and using it as a beach cover up.  It's a size 30, I'm a size 12 on top, it's enormous on me, too enormous to just take a few seams in, and the v-neck comes down past my clevage.  Plus the beading and embroidery makes it too heavy for wearing in the heat. 

I think there is enough fabric to re-make it into a better fitting short sleeved top, and a small bag as well.  I hope that counts.

I don't even have to wear them.  I have a drawer full of almost all home made tops (the exceptions being half a dozen gig t-shirts), all nicely folded up and divided up using Ikea Shrubb organisers.  It gives me a great thrill every time I open it, partly because they are all unique, and partly because it's probably the only part of the house that is perfectly organised!