Hi! With your stack, I would wear the Clover bangle which you already have. Your Clover is a beautiful bangle, and I do not think it's dressy at all (I recently asked my SA to send me a WG Clover and can't wait to get it!)
The Clover is pricey, but pricey jewelry does not always mean dressy.
At its core, the Clover bangle is nothing more than a beautifully crafted gold bangle. The metal work on the Clover is very detailed, and the milgrain edges are well done. However, it's just a beautifully done gold bangle. Yes, there a a few diamonds, but they are so tiny, you barely see them. The eye first sees the beauty of the metal work. Perhaps if you see the Clover as a lovely "gold bangle with a few diamonds sprinkled on it" you will see it in a different light and feel more comfortable wearing it casual. There are many ladies who wear non-branded gold bangles with diamonds casually everyday. I think a Clover bangle looks great casual, with shorts or jeans.
I personally do not think Serpenti goes with Alhambra or Perlee.
Alhambra and Perlee are collections with soft rounded edges. Both these collections have milgrain edge beading, hence Alhambra and Perlee work beautifully together. Serpenti is the opposite. Serpenti is a more architectural and sharp look, with the edges having a bezel-like frame.
In addition, because of Serpenti's thick bezel, the eye sees also a lot of white metal which gives it a cold look. Don't get me wrong, I love the cold white metal look, and platinum/WG are all I wear. However, in the case of the Serpenti, the sharp design plus the thick cool white metal worn next to the rounded Alhambra and warm soft YG is not a great look to me. This combo takes away from the beauty of each piece to me. That's just my opinion. Of course jewelry is very personal, and in the end, one should just wear what they personally love. There is not right or wrong with jewelry.
I really really really vote to wear your beautiful Clover.
It's a gorgeous bracelet, and it will look fabulous with your Alhambra bracelets. If you truly love the Serpenti, I would think what else you will wear with it. If you plan to wear Serpenti with other VCA pieces, to me, the only collection I see it working with Lotus. I have a Lotus ring/earrings, and I can see it working well with the Lotus collection. The pointy edges of the Lotus flower will work with the sharp bezel edges of the Serpenti. The flower and the snake... the Garden of Eden theme! You may also have the Lotus collection, so perhaps try Serpenti with Lotus to see if you like it.
If Serpenti does not really go with your jewelry or fashion look and certainly if Serpenti is not love at first sight, I would pass on it.
Just my two cents for another point of view. Hope that was helpful. Good luck in your decision.