If it were me and I wanted to stick with the dress I’d do: black opaque tights, purple dress, dress boots, leather jacket.
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not stupid. I’d go for higher denier black tights. They are warmer and less likely to get holes than the alternative
e.g.
(I have M&S tights from my last trip to the uk, but you might not want to have them shipped that far)
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oh, and I’d swap out the sandals for leather shoes or boots (not steel toed). Tights with sandals is a very fashion forward look that I think is difficult to pull off.
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LOL, I kinda love that you needed to specify that 
(I suppose wearing my hiking shoes that I wear everyday wouldn’t be it either eh).
I think I do have fashion boots. I don’t know if they still fit.
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I think this person needs to clarify their vision for their attendees!
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In cold weather, I wear leggings + boots with my dresses, plus a cardigan. I’ve never found tights comfortable. Fashion boots are good, and with that dress code, I think you could also get away with Ugg-type boots.
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I think there’s only five of us in plainclothes, the rest will be in uniform
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I love the purple dress and it is much easier to add warm accessories than the white. Also purple is fantastic and imagine if all the civilians do purple? If you have shapewear/a slip and it’s comfy for you, it is like stealth long underwear as another warm layer.
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Agreed with plainjane. Purple dress. Black opaque tights. (Depending on the fabric of the purple dress, a slip may be helpful.) Black fashion boots of some sort; you could also try black loafers or ballet flats if you have them, but they won’t be as warm. Black or purple cardigan. Maybe a nice big scarf.
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alternative option if slip skirt sounds annoying - black bike shorts or jockey ‘skims’. advantage of additional warmth
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good call - especially given the preferences of some of the others.
Down side is, one person is unknown to us, and I wouldn’t want her left out
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It feels like when my uncle-in-law asked about the dress code for my wedding, and whether it was sports coat or suits and i was like - i dont know what a dress code IS at that level! All i know is “jeans yes or jeans no” and i knew some of my young cousins at least would be wearing jeans 
i was unreasonably stressed by that question
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I told people ‘no ripped jeans’ which I learned later was not seen as helpful either can’t win
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The others have already covered it. Nice warm tights or leggings, fashion boots, cardigan or shawl. Gray boots would be lovely and unexpected, but black are more likely to already be in your wardrobe. I have some warming tank top undershirts that I wear to winterize my wardrobe. It is like sneaky longjohns.
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If you end up needing to buy some shoes anyway, I say go with gray boots instead of black. I’ve found gray shoes are great to have. Gray goes with a shocking amount of stuff.
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you overestimate my wardrobe.
(I have a brown pair, but I don’t think they fit. I think I am boot shopping this weekend)
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Flats, loafers, or Oxfords would also work with dress and tights, I think. Especially if black on black tights.
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I said MORE likely, not definitely 
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I like the boots with it, but see what you mean about the decolletage. Could you safety pin the neckline so it crosses over a bit higher? Try about an inch or 2 up from the v now.
A necklace would also help fill the space if you wanted to go that route.
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