Learning how to wear leggings

A boy learns more about dressing as a girl

Arthur's panties were showing

Ever since Arthur had come out to his three closest girlfriends about how much he liked to cross-dresser they had been very supportive and encouraging to help with his feminization. They were always ready to offer him advice on what colors and styles looked best on him. Sometimes they even disagreed among themselves but when the girls saw his choice of outfit today they all agreed on his mistake.

Arthur had chosen to wear a pink top and tight lycra blue leggings. At first they girls all said he looked very sexy but when he lead the way towards to the mall where they planned to do some shopping all three girls gasped in horror. It was Ann who was first to speak.
"Arthur, you can't go around like that!"
Arthur didn't understand what the problem was. The girls had all just told him he looked very cute.
"What's wrong?" he asked.
"You have a terrible VPL," Judy told him.
"A VPL?"
"Yes, a visible panty-line," Emma explained. "Your panties are showing through the back of your leggings. If you want to wear legging as pants you must only wear a thong."
Arthur suddenly felt very self-conscious that everyone could see his panties. He didn't know what to do. It was Ann who took control.
"Come on," she said. "It's just one of those things you will have to learn if you want to be a girl. There is a lingerie shop in the mall. We'll go there first and get you a thong..."