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I really like the newest pattern in power armour those death watch vets are suited in. It gives them the living garbage can look that I really dig.
But why are they wearing it at all, don't deathwatch marines use their own old armour instead of a new unique pattern ?

It isn't a unique pattern. Mark VIII Errant-pattern armour is the newest variety, it's the basis for Grey Knight power armour and it's been sneaking into various Space Marine kits recently. The bulked-up shins and collar are the easiest visual cues for identifying it.

As to whether Space Marines bring their own armour to the Deathwatch, in the 40k era few suits of power armour are all a single pattern. They tend to mix and match components as available and as necessary; the Deathwatch is going to have more access to newer and fancier kit like MkVIII power armour, so they gave you a box of mostly that expecting at least some mixing and matching to go on. Some of the components in that kit might have been acquired there as replacements, some might have been brought from home, who knows? Each suit of armour may have a story all its own.

I don't have my book handy right this moment, but I think the Deathwatch Codex says they can either keep their own armor or they get a new fancy suit of MK VIII.