How many players are allowed to dress?

I notice that some of the members of the roster do not dress for games, namely Cavil, Quinnie, Kornegay (until now) and Fatafehi.

How many dress for a game?

Help me out as I am a bit confused. :?

42 players dress for each game. Roster must be submitted 1hr before game time as i understand it

46 on the Active Roster
42 dress for each game
4 reserves for each game

They should have saved the laundry bill and dressed only half of them last game the way they played.

They should have saved the laundry bill and dressed only half of them last game the way they played.