Shia LaBeouf -- Good to See Ya, Mom ... Please Do My Laundry (PHOTO)

Shia LaBeouf made it out of South Dakota -- after a couple wild weeks -- but he's still wearing the same damn clothes he was sporting in the Badlands.

LaBeouf was out in L.A. ... taking a Sunday afternoon stroll with his mother, Shayna Saide -- and something about him looked familiar. The last time we saw Shia was late last week dancing around a hotel parking lot in SD with his film crew, and he clearly LOVES that sleeveless black shirt.

Question is -- does he love it enough to wash it every now and then?