You go to the closet and hang up the rest of the collection. Then, you take down the purple shirt and put it on. Feeling a penis extend again, you put on a pair of running shorts as underwear and cover it with a pair of jeans.
You take a bus back to the old store location, but as you approach, you remember that it has closed. Fortunately, there is a note in the window that says it has relocated to a spot just down the road from your apartment! You sigh disappointedly and grab a quick lunch, then travel back to the store.
You find a different clerk than before, one with a smile on her face despite the lack of business. You also notice a number of other items in the store, but none really catch your eye. You go up to the clerk, and find out she's actually the owner. She looks no older than 25, but seems extremely knowledgeable.
"How can I help you?" She asks.
"I came a while ago and bought up most of your t-shirts," you respond, "and I was wondering if you could tell me some more about them."
"Ah, so that's who cleaned out our stock of those. Curious, are we?"
"Of course!" The owner smiles genuinely at that.
"Well, what would you like to know?"
"Well, there are two things. First off, do you have any more?"
"Certainly. I managed to find this location with really low rent, so I'll be here for a long time, and new shirts will be coming in regularly."
'Thank goodness for that,' you think, 'I was afraid there wouldn't be more!'
"For the same price as before?"
"Well, since you look to be a potential repeat customer," the owner replies, "I'll make an exception in your case."
"Awesome! Secondly, what happens if I try to wear two shirts at once?" The owner somehow managed to perk up even more at that.
"Ah! That's an interesting one. By now, I think you'll have noticed they are brimming with transformation magic. Well, they are designed, when possible, to merge when one is on top of the other, combining the effects. Which shirts have you bought?"
"Plain white, grey, black, pink, yellow, red, blue, purple and green, flesh on top with brown, green, black, white and blue, white on left and black on right, and the wolf, fox, sheep, rabbit and cow shirts."
"I see... well, let's put it this way. First off, the and plant girl shirt is designed not to merge at all.
"The the plain shirts that still maintain human species apply to the others. Thus, if you combine, say, the pink and rabbit shirts, you get the rabbit traits plus the exaggerated feminine traits. As another example, if you combine the pink and centaur shirts, you'll get more muscle on both the human and horse parts.
"The animal pattern shirts, if combined with the taur shirts, will only affect the upper body. So, if you wear both the cowtaur and fox shirts, you only get fox effects on the human part.
"Shirts that make a drastic change to anatomy may not always be merged. The only animal or taur shirt that the black one can be worn with is the spidertaur shirt. Taur shirts do not mix, and neither do animal pattern shirts.
"If you try to merge shirts that don't mix, you get only the effect of the one on the bottom."
You nod your head, and actually write this down on your notepad. You realise you have one more question.
"The white, yellow, pink, red, purple and blue shirts. What happens when I only mix these?" The owner thinks it over.
"Tell you what, I'll tell you what blue, pink, purple and red do first, because those are the most complicated.
"The blue shirt turns females male, and exaggerates the masculine physical characteristics of those already male, but reduces their mental characteristics when unfocussed. The pink shirt turns males female and both exaggerates feminine physical characteristics and regresses passive mental ability regardless of normal sex. The red shirt increases the muscle mass of females, but turns males physically female without other physical or mental effects. The purple shirt gives the user both sexes' genitals but changes nothing else.
"Now, what happens when you mix them? Well, combining the red and blue shirts makes males female hermaphrodites without a mental effect, but acts purely like the plain purple for females. Using pink in place of purple there adds the mental effect, too. Mixing pink and red makes the pink even more extreme in males, but in females, it combines the muscling effect of the red shirt with the passive mental regression of the pink shirt. Finally, adding purple to a form that already has a penis increases the penis' size.
"White and yellow are the interesting ones. White increases breast size and fills the breasts with milk when worn, and causes lactation. While worn, the amount of milk does not decrease even when milked, but the milk can be removed once the shirt is. This affects all breasts, not just the original pair. If there are no breasts already, then it adds breasts but does not cause lactation. Yellow causes loss of bladder control and keeps the bladder consistently full when worn, regardless of form. (As a tip, it's quite interesting when those two are merged.)"
You nod eagerly and note down all of the information. You realise one thing is missing.
"What about black and white, though?"
"I knew I forgot something! The black and white shirt can be merged with up to two animal shirts, but not with the taur shirts. It can also merge with all plain shirts except the black shirt."
You review your notes. "Wow. That's a lot to take in."
"It is," she says, chuckling, "but having told you what they do, you don't seem too eager about some of those. No worries, we all have our tastes. I won't hold it against you if you do some more experimenting before coming back, so you can come back later if you like."
You look around the store, and decide to...