If you need clothes tailored in Madrid, Spain then check out the Taller de Costura at Buenavista,9 in Lavapies. I love them, they are super sweet. Their dog can seem ferocious but he is all bark and no bite. Tip: he doesn’t like it when he can’t see your eyes so take off your sunglasses when you visit, it will calm him down. I also will occasionally bring him a little treat to get on his good side.
I have had all kinds of work done at this shop and never paid over 10€ for a job. Plus they are super friendly and help you to feel comfortable practicing your Spanish.
I have never had anything come back badly tailored and when not in a rush most items are ready in 4-7 days. They can get pretty busy but if you live in the neighborhood it is definitely worth it to check them out.