What footwear is authorized for flight suits? It is the opinion of some that only boots can be worn with AF flight suits.

CAPM 39-1 authorizes any style plain black shoe or boot to be worn with the CAP Flight Suit and AF style flight suit. Wings or regions may have added some specific requirements for footwear because of unique conditions or circumstances. For instance, local commanders may authorize dark color insulated boots during winter flight operations.
Sage green and tan or desert-suade boots are not authorized with any flight duty or field duty uniform.