The phrase "also extravagant" is correct and usable in written English.
It can be used to describe something that is not only extravagant but has additional qualities or characteristics that are also extravagant.
Example: "The event was not only lavish but also extravagant, featuring a stunning array of decorations and gourmet cuisine."
Alternatives: "additionally lavish" or "furthermore opulent".
"Robinson Crusoe" is also extravagant in Mr Harry Bright's shiny production.
Scialabba's retirement party was quaint but also extravagant; at the end, two brass bands took the stage and charged down the aisles, a conga line snaking behind them as chants and cheers mingled with the honk of instruments.
The plots run as efficiently as Bond's 4.5-liter Bentley, with scarcely a wasted word, but the books are also extravagant, with their over-the-top villains — Hugo Drax, Emilio Largo, Goldfinger, Ernst Blofeld and his creepy consort, Irma Bunt — and their parade of barely clad heroines so absurdly named they sound like lingerie brands: Solitaire, Tiffany Case, Honeychile Rider, Kissy Suzuki.
You want your gift to be appropriate -- not too extravagant or intimate, but also not too impersonal.
But they also worry that some are simply too extravagant.
A flamboyant dresser – she often wore a feathered turban – she was also an extravagant home-maker.
Internet writing also encourages extravagant combining of exclamation points and question marks.
There was also an extravagant chocolate dessert from Blue Mountain chocolatier Josophans Fine Chocolates.
Ms. Ciriello also makes extravagant raspberry bars, $7.25 for five, and pecan-coconut bars, $7.25 for four.
But accessories and perfume cannot sustain a fashion brand's prestige; the company must also stage extravagant runway shows featuring garments of outlandishness, originality, and fantastic expense.
This massive, bronze monument to the Church's founder is not simply the altarpiece for the apse, but it is also an extravagant encasement of an important relic: a chair that many believed to have been used by St. Peter.
