Hi Op, I can confirm the fold is awesome quality. However, my tip (I sometimes have to speak) is to start with you. Last time you went out somewhere smart, but felt good/yourself, what did you wear? Can you wear this again? Or what did you last wear to something like an art gallery, if attended nothing that smart/corporate recently? It may actually be something as “simple” as spending your £ on smart new shoes or accessorising your existing outfit more appropriately.
Otherwise, I am also short and for gravitas, I too find that trousers work best. I put these with a long top (same colour). For you, perhaps a V neck or wrap top. Ideally a jacket as a pp said. Get your nails done, have a haircut, smile. I go for dark colours since these suit me, and I prefer my body not to be a focus. Other people get energy from bright colours. I’ve realised I’m not those people. If you want a bit of colour then a small silk scarf tied around your neck, or a necklace in the metal that suits you (silver im guessing).
Incidentally, to your first linked choices choices, I love the green dress, but it may be too long on you, and emphasise your chest? The black and white skirt, nice - but I once bought similar: disaster unless you are whippet thin in my view. And the final patterned choice, I tried similar recently from that company, the dress seemed designed for someone considerably taller, material was too thin, and just didn’t work. But of the three, the simple green is the best. You have great style op.
Oh and about weight, we all judge ourselves so harshly yet (i at least) have never judged another woman for being overweight. Also, if you have a really nice ring, or nails, or shoes, people will remember you for that (in terms of style!). Very rarely do I remember another woman’s outfit unless there’s something extraordinary about it, so if you aren’t feeling great and want to blend, keep it very neutral and simple - and maybe even based on something you already own but improved by new shoes etc as above. Do a whole closet audit if you can face it! I’m planning to do one this weekend, since I’m fed up of mindless buying!