How to explain to the 店員 that I'm an "inverted triangle" body type?


Recently went to buy some shirts to wear at work, I exercise a lot (cardio,
weight-training and calisthenics) so I have pretty large shoulders and a
(smaller? regular?) waist.

I tried explaining that I'm an "inverted triangle" body type and was told
something called "Y体", at first I thought it made sense but when I tried them
on, the ones that fit my waist I couldn't even get my forearms into, and the
ones that fit my shoulders and arms were like 1.5 times the size of my waist,
came to the conclusion that this "Y体" is just a "rectangle" body type (why
it's called "Y" beats me...).

How would I explain an "inverted triangle" body type in Japanese?




The literal translation, 逆【ぎゃく】三角形【さんかっけい】(型【がた】)(の体型/ボディー) makes perfect
sense ([`逆三角形 体型` on Y! image
search](https://search.yahoo.co.jp/image/search?ei=UTF-8&fr=sfp_as&aq=-1&oq=&ts=3177&p=%E9%80%86%E4%B8%89%E8%A7%92%E5%BD%A2%E3%80%80%E4%BD%93%E5%9E%8B&meta=vc%3D)).

I have no idea what a Y型のボディー is (it may be jargon used by someone, though).




The literal translation, 逆【ぎゃく】三角形【さんかっけい】(型【がた】)(の体型/ボディー) makes perfect
sense ([`逆三角形 体型` on Y! image
search](https://search.yahoo.co.jp/image/search?ei=UTF-8&fr=sfp_as&aq=-1&oq=&ts=3177&p=%E9%80%86%E4%B8%89%E8%A7%92%E5%BD%A2%E3%80%80%E4%BD%93%E5%9E%8B&meta=vc%3D)).

I have no idea what a Y型のボディー is (it may be jargon used by someone, though).

