Given the Cyclops thread I thought I'd do one on Jean as well :)
Once again, this link will be handy:
The original with the cap-Wore this 'training' outfit for most of the early 60s
The original with the mask-Given a face mask that shows off more of her hair a few issues on.
The green/yellow Neal Adams era outfit-The first real 'superhero' outfit, Jean would use this color scheme on several of her later outfits.
The Pheonix outfit-When the Pheonix copied her she adapted this outfit.
Dark Pheonix outfit-The red/gold scheme of the corrupted pheonix. Interestingly Jean would later reuse this color scheme on some later outfits.
X-factor green and yellow look-With the big 'X" using Jean's traditional 'hero' colors.
X-factor Green red/yellow look-Pretty much the same as above but using "Dark pheonix" colors.
The Jim Lee most of the 90's look-The Jim Lee look pretty much became the norm for most of the 90's
The Morrison outfit-Jean's outfit during the Morrison era. She also often switched the T-shirt for one showing a Pheonix pattern.
Others-Ultimate, movie etc. go here.