Comp Rules wrote:
117.12. Some spells, activated abilities, and triggered abilities read, “{Do something}. If {a player}
{does, doesn’t, or can’t}, {effect}.” or “{A player} may {do something}. If {that player} {does,
doesn’t, or can’t}, {effect}.” The action {do something} is a cost, paid when the spell or ability
resolves. The “If {a player} {does, doesn’t, or can’t}” clause checks whether the player chose to pay
an optional cost or started to pay a mandatory cost, regardless of what events actually occurred.
Example: You control Standstill, an enchantment that says “When a player casts a spell,
sacrifice Standstill. If you do, each of that player’s opponents draws three cards.” A spell is
cast, causing Standstill’s ability to trigger. Then an ability is activated that exiles Standstill.
When Standstill’s ability resolves, you’re unable to pay the “sacrifice Standstill” cost. No
player will draw cards.
Breath of Fury will not grant an additional combat phase. I included the first example because it's similar enough to the scenario described with Assault Suit.
Specifically, according to the above rule, Breath of Fury has you paying two costs, "sacrifice {enchanted creature}" and "attach Breath of Fury to a creature you control." Both costs must be paid to get the effect after the "If you do" clause. Assault Suit prevents you from paying the "sacrifice {enchanted creature}" cost.
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