Funnily, only the Welsh-language wikipedia entry spells out the connection clearly: http://cy.wikipedia.org/wiki/Hollt_Gwener

The answer is copied from http://www.nciku.cn/search/all/camel%20toe: 1. the visual effect created when a woman's trousers cling too tightly to the crotch, emphasizing the shape of the pudenda 2. C20: from the alleged similarity between this effect and the shape of a camel's toe

You are in very dangerous territory here. The sentence should be "Don't use leggings without pants! They might be able to see your camel-toe." It is not polite. I don't recommend you going around talking about camel-toes. Particularly to horny guys.

i love it

i like 'em