This Tshirt is by https://simplybrightstudio.com/ and I would love to know the exact font.
Found some similar fonts like https://www.dafont.com/colors-of-autumn.font but it doesn't have that brushed effect.

I didn't find such a font so my suggestion would be to contact the studio and ask -- the worst thing that can happen is they will not tell you. Their web site doesn't show this product so it may be a discontinued one and they might well share the font name in that case. Their contact info is: brittany (at) simplybrightstudio.com