I could be wrong, but my recollection is that Pinky's suits start at 10,000 THB, unless he's raised his prices recently. So if your maximum budget is 10,000, you might still be able to get something from him. Ultimately, do whatever you're happy with. If you're pleased with the quality and price of a very low-end suit from Crown, then go for it. If a little better suit from Raja or Rajawongse pleases you, then by all means buy it. Being happy and confident when wearing your suit is certainly a very big factor in how you project yourself to others. I've seen guys wearing expensive designer suits but who are very obviously uncomfortable in the suit and it comes off meaning they lose their confidence and thus lose more than they are trying to gain by wearing expensive designer clothes. Other guys wear the cheapest of suits but think they got the deal of the century and think they look great, thus giving themselves lots of confidence.

There are a huge number of people who don't know how to tell the difference between a good suit and a bad suit. These are the people who keep the hordes of bad Bangkok tailors in business. Some of them go onto the internet seeking advice on where to go to get a good tailored suit and so my advice to them would be to go to Pinky's if they're on a budget of 10,000-20,000 THB / suit, and to go to Art's or July if they're willing to spend more. If they don't want to even spend 10,000 THB, I'd recommend they buy find a good bargain off the rack suit in their home country that fits them well. Do not buy any custom-made suit in Bangkok for less than 10,000 THB. It will simply look awful, likely not last, and you will have lost all advantages that a custom made suit should be giving you.

For first timers, go into the these recommend places as a starting point and have a look and see if the quality/price is what you're expecting. Then if you're not pleased, or just want to see what else is available, go have a look at the other places.

One final comment about the tourist tailors. Everytime I've walked past Raja's or Rajawongse, they are packed with customers. Pinky's is off the main road, so I don't just walk by there often, but when I've been in his shop he's had lots of customers. In other words, lot's of people are satisfied with them and give them repeat business and tell their friends to go there. Even though they typically sell low to mid range suits / fabrics, their high-volume allows them to probably buy a bit cheaper, offer a bit more selection of fabrics, and make a slightly higher quality constructed suit than their competitors. I've not ever seen any other customers in Crown. Likewise with most of the tourist tailors - they have almost no customers and so don't have the advantages that the high-volume tourist tailors do. They also don't have any reputation to protect. For high-end tailors, they aren't selling to the masses and so you wouldn't expect to see crowds in their shops, which you don't.