Because of this.

A normal day of shopping turns into a zany scene at Wide and Round, the clothing store for fat toons. As the wuff entered the small store, was greeted by an adorable red panda who encouraged he try on some of the latest fashions. It only took a few pairs of clothes for the red panda to comment about the wuff's beauty (both as a salesman and a fat fashion admirer). It took a few flirtatious comment about the wuff's weight for the fun to begin, however...

The red panda connected the wuff's inability to fit in the same clothes with the wuff's blushing. And, the red panda loves what he sees, closing the store for "lunch". The red panda kept suggesting trying on new clothes, only for them to be torn into scrap by the expanding wuff. The wuff in turn was trying to control himself, but the red panda's comments and his voice were too adorable to resist so easily...

But eventually he figures out what's going on here.

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Clothes tend to never survive with Wontoon (unless they are designed with stretch in mind! Things like Wontoon expanding when he's blushing, or adorable red pandas are a danger to clothing that Wontoon wears!

I neglected Wontoon's fattening by blushing thing he has, so here's a pic of it in action.

The red panda is of course doing this on purpose. Why? He does carry clothes that stretch with expanding 'toons, but he's conveniently not mentioning them yet.