Yes, Beshine definitely has custom made clothing. Look at the stitching on T-shirts she wears and you can see where extra material had to be added in order for it to fit since the T-shirts and tops were made for a regular woman and it is not an XXXL size T-shirt originally made for men. This old morph of Beshine you can still see the extra stitching necessary to make it work. 
Clearly her bras are custom made, however, most of her tops are either very stretchy or as she has stated, very over sized 4XL. When I look at Beshine in that white stretch top, I see the side seam that was intended to go from under the arm straight down the side, being pulled forward as the garment is stretched, so it ends up on the side of her boobs, You will see the same effect in all her stretch tops. In her off the shelf 4XL, you see the large sleeves pulled forward and draping from her sideboob or when it is sleeveless, a gaping area of sideboob exposed as the sleeve is pulled a half foot forward. Even in the gym picture, you can see that effect despite the type of shirt which she lately seems to have substituted for bras. Look further up to the turquoise dress; the cloth intended to cover a chest is under her boobs and what now covers her areola/nipples is the cloth intended as shoulder straps (other photos show the strap is not wide enough to cover her large areola). In all her sets, you will see either the side seams pulled dramatically forward or the sleeves pulled half way out her projection, depending upon stretch or oversized.
What has Beshine had custom made? Clearly her huge implants. Bikinis; after the tiny pink one proved woefully inadequate back in the 8k days, I think Beshine buys off the shelf and has them modified. Bras; like bikinis, they have to fit right and no sport style bra is made in a what, 34ZZZZZZZ? On top of that, they have to be industrial strength, not to hold her boobs up (the shoulder strap is stretchy and only serves to stop the bra from sliding down), but to squeeze all that weight together. I think some of the low cut dresses from the 10k days were also modified; shoulder straps becoming neck halters and neck halters extended with extra cord when necessary.
The sleeves & seams are seen pulled forward since the early days as seen in this 2011 era pic, and have only gotten more pronounced as Beshine's boobs got larger. I chose this picture because, braless, you can see both the seam and the sleeve gap pulled forward. Make no mistake, when Beshine goes shopping, it is a lengthy affair, because she has to try on everything for fit (as you see in all dressing room pics; like a couple dozen in the room at a clip). And just like that shirt you are wearing at this moment, that side seam is intended to go straight down, but be pulled dramatically forward, but welcome to the world of how store bought fits Beshine.