The people of the world are a diverse bunch, so it's simply impossible for every design to fit everyone. As a result, many companies identify target body types and tailor clothing to suit them specifically. This is why so many shoppers tend to find and stick with brands that work well for them.
"When clothing is designed and fit, it is often fit on ONE fit model" explains Mariana Leung, a fashion and design expert with Ms. Fabulous Media. "Of course, bodies of all types buy the clothing, so various shapes can cause clothing to ride up if the person is different from the model." For example, Leung says that people who are particularly voluptuous naturally make the hem of a T-shirt rise higher than their less-endowed counterparts, even if they have similar measurements otherwise. This can quickly throw the fit of a shirt out of whack, causing it to ride up.
Sometimes, designers are able to make adjustments to particular mass-produced pieces to mitigate the effect. For example, Bensly, a luxury line for men, recognized that the majority of boxer shorts bunch up, regardless of the type of fabric used. "To reach a solution that covers the entire gamut of leg shapes and girths, we had to re-work the fabric patterns instead," explains Bensly founder Miguel Madrid.
"We started by extending the legs to an 8-inch inseam and then tapered the extended length so that [the fabric] narrows as you go down to the leg opening," he says, noting that this results in a truncated cone or pyramid shape. "With the leg inserted, the shape wraps around the leg at the lowest and thinnest point of the quad. The quad increases in girth as you go up, so the underwear prevents ride-up by 'gripping' the quad using an ultra-soft stretch blend of our Elite Series Tencel [fabric]."
Tweaking the design of complex garments, like tops and skirts, to suit the differently shaped masses is more difficult on the front end. This is why many shoppers resort to using a good tailor to add darts and take in cumbersome extra fabric where needed, a strategy that Perez encourages. "Buy clothes that fit the biggest part of your body and take them in to fit to your proportions," he says. "All clothes need a little bit of alteration, and will look so much better on you."