The LL ones look good, but are probably wetsuit. I've just started swimming again for the first time since last winter - the problem isn't the cold (it's still about 7 degrees), it's the utter lack of fitness - entering these events will force things along, hopefully...
There are a couple of swim-runs up in Scotland, I think there is one that zigzags across Loch Lomond. They look excellent fun.
But no, I haven't swam since September, indoor or out.