There are 4 costumes to collect during the RE14 Remake, but some of them are quite difficult to unlock.
The plot of Resident Evil 4 Remake tells the adventures of government agent Leon S. Kennedy, who goes in search of Ashley Graham, the kidnapped daughter of the president, in a remote Spanish village where a creepy cult flourishes. Arriving at the place, he almost immediately loses all his escorts, because of which he has to carry out the mission alone. As you progress through the story campaign, you will have the opportunity to unlock various cosmetic upgrades.

If you wish, you can safely change the standard costumes of Leon and Ashley. To do this, you first need to complete the requirements associated with new costumes, after which you will have the opportunity to select new clothes in a separate menu. The Resident Evil 4 Remake features fourteen different costumes, but not all of them are easy to unlock.
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How to choose costumes in Resident Evil 4 Remake

To change costumes in Resident Evil 4 Remake, you need to go back to the main menu, select the "Main Story" section, and then go to the "Extras" menu. In this menu, you can choose the desired costumes for Leon and Ashley from those already unlocked. Some of them can be opened during the progress of the game, while others appear in the list only after purchasing various add-ons.

If you've unlocked new costumes after beating the game, you'll be able to unlock them in the power-up menu and then equip them in the Extras menu so that the characters wear your chosen costumes throughout the story campaign.
All Leon costumes in Resident Evil 4 Remake

For Leon, you can choose one of the eight available costumes. Most of them are unlocked after beating the game for the first time, and some of the outfits can be purchased in a special DLC pack with bonus content. If you are playing the standard version of Resident Evil 4 Remake, then these costumes will not be available to you.
Costume | How to get | In-game price |
By default | Opens immediately after starting a new game. | Free options |
Jacket | Unlocked after completing the story campaign. | 500 EP |
T-shirt | Unlocked after completing the story campaign. | 500 EP |
Striped suit | Unlocked after completing the story campaign. | 2 OR |
casual suit | Included in the paid DLC. | Free options |
"Romance" | Included in the paid DLC. | Free options |
Hero | Included in the paid DLC. | Free options |
the villain | Included in the paid DLC. | Free options |
All Ashley's costumes in Resident Evil 4 Remake

Although Ashley only becomes a playable character at one level, there are six different costumes for her in the game. Unlike Leon's outfits, not all of Ashley's costumes are purely cosmetic - one of them greatly enhances her survival abilities.
Costume | How to get | In-game price |
By default | Opens immediately after starting a new game. | Free options |
Jacket | Unlocked after completing the story campaign. | 500 EP |
Without jacket | Unlocked after completing the story campaign. | 500 EP |
Armor | Unlocked after completing the story campaign on Hardcore or Professional difficulty with an A rank. | 2 OR |
casual suit | Included in the paid DLC. | Free options |
"Romance" | Included in the paid DLC. | Free options |
As you can see, Ashley's armor is the hardest to get in Resident Evil 4 Remake, but it's the most powerful armor available in the game. If you equip it during the passage, then Ashley will become completely invulnerable to all enemy attacks.