1a. I stitched my shirt at Mount road tailor.
1b. I sewed my shirt at Mount road tailor.
2a. I got stitched my shirt at Mount road tailor.
2b. I got sewed my shirt at Mount road tailor.
3a. My shirt was stitched at Mount road tailor.
3b. My shirt was sewed at Mount road tailor.
Are all sentences OK?
Do they all mean the same?
1a/1b seem to imply that you did the stitching/sewing yourself.
2a/2b should be “I got my shirt stitched/sewed…”. This means that someone else did it for you.
3a/3b are OK (except for issue noted below). They also mean that someone else did it for you.
In all cases “Road” should be capitalised. “at Mount Road tailor” is OK if the shop is customarily known as “Mount Road tailor”, but otherwise one would say it another way, such as “at the tailors on Mount Road”.