Well ok, you know the collab has a bit of each of us in it..... considering SITW was a previous game to the collab's timeline I thought it would be necessary to remake Sesi's XP sprite into a more aged one.
in SITW at the beginning Sesilou's around 17 years old.... by the end of SITW he's 18...
in between the collab and SITW a year passes (non documented) and thus at the beginning of the collab Sesilou is at the age of 19. of course his sprites have changed as well.
in total he wears 3 suits.
the D-Soldiers suit (suit by default, you'll see him most of the time like this)
the SITW suit revamp (this suit is a faithful replica of Sesi's SITW clothes.... if you get a special code you can wear these over the D-Soldier's uniform instead in some areas.... people might also throw out free items as well)
and then there's Sesi's Student clothes (a suit best used when going incognito through the streets of Johto *playable area if all goes well* and some buildings,)
the post should come with the sprites inserted.... I hope
if you notice the differences he now has a short ponytail as well as a stronger build