So, to answer the question:
TOS:
one spacesuit type, plus the apparent
cold weather gear from "Naked Time" and assorted partial protection in early eps
TAS: the
life support belt
TOS movies:
three spacesuit (or other protective coverall)
types in TMP, two of which survive till TWoK, one till TUC
TNG: the hazmat suit of "The Child" that may be a pressure suit in "The Hunted"
TNG movies:
one spacesuit type,
one invisibility type
DS9: no indigenous suit, but ST:FC one used, plus that fancy
thing Seyetlik wore in "Second Sight"
VOY: no indigenous suit, but ST:FC one used, and all sorts of fancy clothing, sometimes with visors
ENT:
three spacesuit types, plus a couple of flight suits that might count
DSC: three spacesuit types
PIC: no spacesuit types so far
for a maximum total of about a dozen Starfleet spacesuits or the like, but a safer bet of ten. Or nine if you don't accept MACO as Starfleet. Or perhaps seven if you don't accept UESF as Starfleet.
(...But add two at the very least if you think the Kelvin timeline suits count.)
Timo Saloniemi