Yet another set of clothes Regret!Sans would wear on the Surface.
The embedded patches by one of his kids on his sweater and the Monster soul on his left sleeve would represent where he originally comes from.
He carries the green healing magic potion around his neck if anyone needs help. Regs can only keep a certain amount there, but it's made by him. He can technically use his own healing magic due to his soul containing Kindness, but his magic is still a little weak, he is working on strenghtening it but it takes time. He used to be a scientist but it took a lot of courage for him to muster in getting involved with science-y stuff again. It's all thanks to his family 🤍He has his days of course.
Oh and his eyelights radiate green. I thought it just looks neat and they get greener, the better he gets at his healing powers.