Hey friend I know you've dyed fabrics before and wondered if you have any tips I'm about to attempt dying a denim jacket.
i’ve dyed a couple of denim jackets! really my only advice is to bleach the living heck out of it and get as much color out of the denim as possible so that your dye color turns out as true to the packet/bottle as possible
i’d recommend powder dyes over liquid dyes. rit dye isn’t that gr8 in my opinion, i use dylon powder dyes and the result has been great every time
i always dye my fabric pieces/jackets/etc outside in a plain ol white five gallon bucket with hot water (so i don’t run the risk of staining my tub/washing machine)
if it’s a white denim jacket, tho, you don’t really need to worry about bleaching or anything unless it’s a polyester blend (if it’s poly blend then the color will turn out lighter no matter what)
if you’re dying a denim jacket darker than the original color, don’t worry about bleaching it (unless you want the blue undertone out of it first)
also i’m sure people in the replies of this ask can provide their own advice/experiences as well! :D