All previous DLC for the original version of Mass Effect 2 is included by default in Legendary Edition. Legendary Edition: The above information regarding credit totals may not be correct if playing Mass Effect Legendary Edition. See the costs of upgrades in the Upgrade Guide to give an idea on whether you can afford both armor and the upgrades. To purchase every armor piece with all discounts would be 54,996 credits, without a discount it would be 66,000.
It is recommended to be selective about purchasing Armor Customization parts as money is fairly limited in the game and always use discounts (less so with all the DLC). Additionally, the player can further customize the armor's appearance by changing its color, reflectiveness or applying a pattern.
Besides augmenting the armor's physical appearance, these pieces also have varying effects on Shepard's combat effectiveness. In Mass Effect 2, Commander Shepard's armor can be customized by swapping out pieces of the default N7 Armor for pieces purchased from merchants, or made available as downloadable content, by using the Armor Locker aboard the Normandy SR-2.