These are all very powerful Light/Heavy attack oriented sets for a stamina playstyle; http://elderscrollsonline.wiki.fextralife.com/Poisonous+Serpent (Procs frequently off LA/HA's, assuming you're also using a Poison DoT such as Venomous Claw or Poison Injection)

http://elderscrollsonline.wiki.fextralife.com/Storm+Master+Set (Empowers LA after fully charged HA crits, quite nice)

http://elderscrollsonline.wiki.fextralife.com/Twice-Fanged+Serpent+Set (Stacks quickly and will be managed well with continuous LA/HA, increasing damage of all physical penetration attacks)

http://elderscrollsonline.wiki.fextralife.com/Molag+Kena+Set (2 piece, resources shouldn't be hard to manage if you're primarily dealing LA/HA damage)

http://elderscrollsonline.wiki.fextralife.com/Spawn+of+Mephala+Set (2 piece, fantastic option if you prefer the fully charged HA route, which synergizes amazingly with Molten Arma)

http://elderscrollsonline.wiki.fextralife.com/Sunderflame+Set (More meta approach, one of the strongest Stamina group sets in the game. Fits well with fully charged HA's and the armor shred can be benefited by all people hitting the target you've applied it to)

I'd highly suggest staying away from Elegance as a Stamina build, as you're going to sacrifice a lot of damage potential from useless stats. You might hit harder per LA/HA but you'll lose so much damage in the long run (crit, other damage abilities, etc) that it's not worth it.

You'll also want to either go with Dual Wield or 2 Handed, as those have the strongest LA/HA damage outputs for a stamina build. Dual Wield allows for two 5 piece bonuses AND a Monster set, while 2H removes that ability, but has slightly higher raw LA/HA damage. Dual Wield will do more DPS however, as the passives synergize better into damage (10% crit from dual daggers is unparalleled DPS output)

You'll still cap out DPS very quickly and won't be able to participate in the harder end game content like Veteran Trials or Hardmodes, but 4 man content is pretty accessible by any build. Just know that a lot of people won't be too keen on what you're doing.

I guess I felt like doing some math this morning. The damage calculation for a heavy attack = 0.055076 (Stat) + 2.1998 (Weapon Damage) - 1.27439. This is roughly a 40:1 ratio for stamina/weapon damage to calculate your heavy attacks with 1 weapon damage equal to 40 points into stamina. So weapon damage is more important for a heavy attack build than stamina but they both contribute.

The damage bonus for the 5th piece bonus on sergeant's mail (assuming 1600 to each heavy attack) is equivalent to 718 weapon damage. If you run jewelry and two heavy pieces you can still fit in a full medium armor set. If CP and molten armaments buff this damage from sergeant's mail ( I don't know if it does) it would be an improvement over queens elegance.

Here's my source for the calculation. I don't know if it has changed. https://forums.elderscrollsonline.com/en/discussion/260709/what-determines-light-heavy-attack-damage#latest