The five-letter word is:
SUITS.
The numbered blocks of empty cells ...
... can be removed from the grid of X's. The tens (and hundereds) of the numbers are the rows and the ones are the columns where the respective cell should be placed. We get:
X X X X X
X . . . .
X . . . .
X . . . .
5 X X X X X
X X X X .
X . . . X
X . . . X
X . . . X
10 X X X X .
X . . . X
X . . . X
X X X X X
X . . . X
15 X . . . X
X X X X X
X . . . .
X X X X X
. . . . X
20 X X X X X
The black and red blocks ...
... indicate that we can divide the cut-out block of X's into four equal parts. If we do this, we get four letters:
X X X X X
X . . . .
X . . . .
X . . . .
X X X X X
X X X X .
X . . . X
X . . . X
X . . . X
X X X X .
X . . . X
X . . . X
X X X X X
X . . . X
X . . . X
X X X X X
X . . . .
X X X X X
. . . . X
X X X X X
The four numbers ...
... enumerate words that begin with the corresponding letters:
black C: CLUBS (5)
red D: DIAMONDS (8)
red H: HEARTS (6)
black S: SPADES (6)
These are the classical SUITS in a pack of playing cards, so this is the final answer we are looking for. (The colours black and red correspond to the colours of the suits, of course.)
Oh, and the title:
Something that suits is something that is fitting.