Put the blouse on inside out
Have a friend pin it to fit you, then very carefully, take the blouse off again, sew along the pins, tying off the ends
Voila, altered shirt
Depending on the alterations you want to make, you can make a blouse fit better by putting on inside out and pinning the sides to fit. Take off shirt and sew along pin lines. Cut of excess fabric after sewing and your blouse will fit more snug.
You could take it to a seamtress in your town or city and explain to them what youd like to do to the blouse. If you prefer to do it yourself you could get a seam ripper and a sewing machine and attempt the alteration yourself
You'll want to take it to a tailor if you've never done any alterations/sewing before. But with trends these days you could easily get away without paying for alterations. Pairing a blouse with a belt or sash at the smallest part of the waist is flattering for virtually every figure.
I usually take mine to my womens clothing specialist store. They will measure you then keep the measurements on file, after that its a drop off and pick up deal.
A blouse altering is possible by first opening the stitches of the stitched blouse. After that, go in for the restitching as per the requirements of the size at present.
You can alter a blouse by removing its stitches. First of all remove the stitches point out
the alterations with pencil and then restitch it. According to the points marked.