Bykowski Tailor & Garb
I used this app, it is the very simple and helpful app for professional tailors, Also they provide free support which is very helpful for any Developer
Get Me Suited
The support for this app was not that good - did not receive helpful responses at all. Further, the app was missing key measurements needed to tailor a suit. Finally, the app was overall pretty buggy and I would not recommend it.
O S Man
Great app for any Tailor. They offer free support.