A fashion designer has to consider all the conditions the clothes would possibly go through. Considering the washer, the dryer, rain dirt, food. The clothes have to be able to withstand all of those conditions. If the clothes don’t, what are they worth? Consider this; If a company  were to design an exercise shirt for the average male man( 6’2” 210 lbs) and distribute it in Arizona, (average temp about 85 F), they would have to factor in all of that information to make the product. If they didn’t use that, where would they be and how would their product work/come together?

• theres no oxygen in space
• extreme temperatures
• constantly bombarded by UV (high energy solar radiation rays that are  blocked on earth by the ozone layer) rays.
• terrible weather
• space is like a vacuum, if someone was wearing normal clothes with a lungful of oxygen, the air would expand and the lungs would burst
• The pressure is also so-so low that the blood drops below human body temperature, a condition that can kill in an instant space is filled with micro-meteors that can pierce an astronaut's suit

Onto regulations and requirements. There would be regulations for this because otherwise, some unqualified person could go and design a space suit that people think would work without even considering what may happen. There are lots of regulations. Here are a few;

• Have a pressurized atmosphere
• Have sufficient oxygen supply
• Eliminate carbon dioxide (a harmful gas)
• Maintain a proper temperature despite of strenuous work and movement into and out of sunlit areas
• Protect from micrometeoroids (tiny meteors that could pierce the astronaut)
• Protect from radiation to some degree
• Enable clear vision
• Allow easy movement of the body inside the spacesuit
• Enable easy conversation with others such as ground controllers, other astronauts etc.
• Facilitate movement around the outside of the spacecraft

• flammability
• stitch strength
• fabric strength
• allover wearability
• Lead content and surface coating limits

For testing everyday clothes, its a little different. There isn’t as much pressure for the product to work out. As its not life threatening if it goes wrong, its not as big a deal as a space suit going wrong. It still is as important in another way though, as a customer may not shop at a store as much if they start getting bad products. It‘s a way of getting feedback from customers before the product goes into stores.  It helps to make the product better than it was. It’s like critique in writing or what the editor does for a book.