My inclination would be to say that either would work, though which would work better depends upon when the later 15th century we are talking about (based on what I see breastplates become more likely the closer you are to 1500). In the ordinances of Charles the Bold (which prescribed the equipment of semi-professional soldiers in his army) archers were to wear brigandines over padded jacks with a sallet and a 'gorgerin' or throat defense (probably a mail standard). Into the 16th century English archers show a preference for brigandines, possibly for ergonomic reasons - the Earl of Oxford's accounts have over 70 brigandines and only 16 cuirasses, and this is in the early 16th century. In other English accounts, such as the Howard accounts, brigandines are the most common. However we do see some archers using breastplates in the Beauchamp Pageant and in a Neatherlandish context the St. Ursula Shrine. Combined with the (limited) presence of breastplates in account books I would hardly say that archers never used breastplates; I think a breastplate is perfectly appropriate.

But if you are a member of a shooting guild and not a semi-professional soldier, simply sticking with a jack would also be appropriate (if it is thick enough - 30 layers of linen or so). This is by far the most common defense mentioned in the Bridport muster rolls in the mid-15th century in England, and was common in the 1480's based on traveler's accounts. However later in the 15th century and in a continental context a stand-alone jack might be less likely than in England (though you also see these in Memling).