'Damn. He still looks like some rich kid with that gaudy armor.'
Ivor seemed like he was just being Ivor when Eren looked at him- someone with old family money. It looked like he was wearing expensive armor for himself that Isen must have bought for him. It was extremely shiny to look at.
The butcher also recognized the origins of the pride mana Ivor was using to manifest this gaudy armor. This was the same intent-based magic he had been exposed to.
The armor did not only protect Ivor from threats. It also enhanced his body stats and response time depending on his feelings. It made him muscular and sharp while increasing his stature a bit. Ivor was as fit as a fiddle even before wearing armor. He looked buffier without compromising his agility with pride armor.
Various elemental and non-elemental runes and symbols would reflect on the golden armor's surface from time to time. It also had the added effect of intimidating the wearer's opponents if they were weak of heart.