cherries Definitely keep the teddy coat. It looks lovely on you (not rotund at all!), and the colour is nice too. I did something with tin foil, baking powder and salt to clean a silver-plated necklace once. It wasn't as fine as hush jewellery, but it may be worth a go if just polishing hasn't done anything...
I'm with soy on sizing down with the leggings. That kind of thing always confuses me - but it sounds a bit like they are too big on the bum and waist, and are slipping down as they warm up and expand. If they were too small, it would probably happen straight away, and they'd probably sort of roll down at the waist rather than go baggy??
Sorry to hear you are feeling a bit down soy and gin. 
and 
to you both. I confess I'm pretty pants at motivating myself to work at home (which is unfortunate, as I'm effectively self employed!) and i do miss the company of other people since I've not been going into an office. Doesn't help that I just always feel really tired at this time of year too, and have been having some late nights with deadlines recently ...I'm living on coffee, which probably doesn't help. (not helpful, I know..)
Those leggings are another good find laska! Excellent for under one of your many Meryls, I reckon 
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On the boots, twosoups - I think if you really can't find anything you like as much, and will get loads of wear out of them and you won't be living on beans for the next month it is worth splashing out. Footwear is something it is worth paying a bit more for, I think - and those won't date and are lovely. But yes 
money.... The coat is lovely too, but if it were me I would go for the boots instead if its one or the other. or buy both and ask for the coat for Christmas from a friendly relative, then magically whip it out and say "ah, lucky you, you don't have to go to the shops..."