It likely depends on the quality of the clothing. If we are talking about a fairly standardized and utilitarian outfit like a t-shirt and straight leg jeans the

It likely depends on the quality of the clothing. If we are talking about a fairly standardized and utilitarian outfit like a t-shirt and straight leg jeans then that would make automated sewing easier. On the other hand, if someone wants to wear clothing that flatters their body type and sense of style, then the robot is going to need to be able to make different patterns. Things like different types of yokes, pleats, princess seams, collar types, etc. The next step is clothing that is tailored for an individual. In this case the robot would need to be able to add darts and other modifications in order to adjust the fit. Note that this and the previous step may need to take into account the behavior of the fabric; e.g. how does it stretch. Finally, in the realm of high end tailoring you have features that are used precisely because they must be done by hand. That being said, there is precedent for what you are suggesting: traditionally kimonos are unsewn when they are washed and then reassembled.