I have a similar situation in that I'm fairly new to gardening and didn't have a "grungies" pile when I began. I'm in a suburban location but the neighbours are out with their dogs etc. so I don't just want to go out in PJs. Often, though, I'm in my gear first thing in the morning, and that works fine for the purpose. Later in the day, I just wear a dress or shorts that are easily washable. I also found a pair of jeans in my donate bin that I rescued for the purpose.
For other seasons, though, and certain jobs, I'm considering a pair of overalls: https://www.duluthtrading.com/.....16760.html
This list gives versions for winter gardening: https://www.gardenista.com/pos.....-carhartt/
What you need is pockets and room to move. https://www.amazon.ca/Rosies-W.....B01M4O7A7O
Anyway...my idea is to find some version of this, especially for spring and fall (summer is easier for me to manage dressing for) and hang it in my garage. Pop it on before I head out.